title: Hierarchical folder system based on text and numbers
body: <p>I am trying to make a hierarchical system of folders based on the Hornbostel–Sachs system (A hierarchical system of musical instruments). So far I have managed to pull a list of the internet.</p>
  
  <p>Now I need to somehow make this list into folders and sub folders. First problem is, I have not exactly figured out how to make a folder with multiple sub folders.</p>
  
  <p>I do not expect anyone to do the job for me. But some help on how to approach this would be much appreciated!</p>
  
  <pre><code>1   IDIOPHONES
  11   Struck idiophones
  111   Idiophones struck directly
  111.1   Concussion idiophones or clappers
  111.11   Concussion sticks or stick clappers
  111.12   Concussion plaques or plaque clappers
  111.13   Concussion troughs or trough clappers
  111.14   Concussion vessels or vessel clappers
  111.141   Castanets
  111.142   Cymbals
  111.2   Percussion idiophones
  111.21   Percussion sticks
  111.211   (Individual) percussion sticks
  111.212   Sets of percussion sticks
  111.22   Percussion plaques
  111.221   (Individual) percussion plaques
  111.222   Sets of percussion plaques
  111.23   Percussion tubes
  111.231   Individual percussion tubes
  111.232   Sets of percussion tubes
  111.24   Percussion vessels
  111.241   Gongs
  111.241.1   (Individual) gongs
  111.241.2   Sets of gongs [gong chimes]
  111.242   Bells
  111.242.1   (Individual) bells
  111.242.11   Resting bells
  111.242.12   Suspended bells
  111.242.121   Suspended bells struck from the outside
  111.242.122   Clapper bells
  111.242.2   Sets of bells [chimes] (subdivided as 111.242.1)
  112   Indirectly struck idiophones
  112.1   Shaken idiophones or rattles
  112.11   Suspension rattles
  112.111   Strung rattles
  112.112   Stick rattles
  112.12   Frame rattles
  112.121   Pendant rattles
  112.122   Sliding rattles
  112.13   Vessel rattles
  112.2   Scraped idiophones
  112.21   Scraped sticks
  112.211   Scraped sticks without resonator
  112.212   Scraped sticks with resonator
  112.22   Scraped tubes
  112.23   Scraped vessels
  112.24   Scraped wheels or cog rattles
  112.3   Split idiophones
  12   Plucked idiophones
  121   In the form of a frame
  121.1   Clack idiophones (cricri)
  121.2   Guimbardes (Jews' harps)
  121.21   Idioglot guimbardes
  121.22   Heteroglot guimbardes
  121.221   (Single) heteroglot guimbardes
  121.222   Sets of heteroglot guimbardes
  122   In board- or comb-form
  122.1   With laced-on lamellae
  122.11   Without resonator
  122.12   With resonator
  122.2   With cut-out lamellae (musical boxes)
  13   Friction idiophones
  131   Friction sticks
  131.2   Sets of friction sticks
  131.21   Without direct friction
  131.22   With indirect friction
  132   Friction plaques
  132.1   (Individual) frinction plaques
  132.2   Sets of friction plaques [livika]
  133   Friction vessels
  133.1   (Individual) friction vessels
  133.2   Sets of friction vessels
  14   Blown idiophones
  141   Blown sticks
  141.1   (Individual) blown sticks
  141.2   Sets of blown sticks
  142.1   (Individual) blown plaques
  142.2   Sets of blown plaques
  2   MEMBRANOPHONES
  21   Struck drums
  211   Drums struck directly
  211.1   Kettle drums (timpani)
  211.11   (Separate) kettle drums
  211.12   Sets of kettle drums
  211.2   Tubular drums
  211.21   Cylindrical drums
  211.211   Single-skin cylindrical drums
  211.211.1   Open cylindrical drums
  211.211.2   Closed cylindrical drums
  211.212   Double-skin cylindrical drums
  211.212.1   (Individual) cylindrical drums
  211.212.2   Sets of cylindrical drums
  211.22   Barrel-shaped drums (to be subdivided like 211.21)
  211.23   Double-conical drums
  211.24   Hourglass-shaped drum (to be subdivided like 211.21)
  211.25   Conical drums (to be subdivided like 211.21)
  211.26   Goblet-shaped drums (to be subdivided like 211.21)
  211.3   Frame drums
  211.31   Frame drums (without handle)
  211.311   Single-skin frame drums
  211.312   Double-skin frame drums
  211.32   Frame drum with handle
  211.321   Single-skin frame drums with handle
  211.322   Double-skin frame drums with handle
  212   Rattle drums (sub-divisions as for drums struck directly, 211)
  22   Plucked drums
  23   Friction drums
  231   Friction drums with stick
  231.1   With inserted stick
  231.11   Friction drums with fixed stick
  231.12   Friction drums with semi-fixed stick
  231.13   Friction drums with free stick
  231.2   With tied stick
  232   Friction drum with cord
  232.1   Stationary friction drum with cord
  232.11   Single-skin stationary drums with friction-cord
  232.12   Double-skin stationary drums with friction-cord
  232.2   Friction drum with whirling stick
  233   Hand friction drums
  24   Singing membranes (Kazoos)
  241   Free kazoos
  242   Tube- or vessel-kazoos
  3   CHORDOPHONES
  31   Simple chordophones or zithers
  311   Bar zithers
  311.1   Musical bows
  311.11   Idiochord musical bows
  311.111   Mono-idiochord musical bows
  311.112   Poly-idiochord musical bows or harp-bows
  311.12   Heterochord musical bows
  311.121   Mono-heterochord musical bows
  311.121.1   Without resonator
  311.121.11   Without tuning noose
  311.121.12   With tuning noose
  311.121.2   With resonator
  311.121.21   With independent resonator
  311.121.22   With resonator attached
  311.121.221   Without tuning noose
  311.121.222   With tuning noose
  311.122   Poly-heterochord musical bows
  311.122.1   Without tuning noose
  311.122.2   With tuning noose
  311.2   Stick zithers
  311.21   Musical bow cum stick
  311.22   (True) stick zithers
  311.221   With one resonator gourd
  311.222   With several resonator gourds
  312   Tube zithers
  312.1   Whole-tube zithers
  312.11   Idiochord (true) tube zithers
  312.12   Heterochord (true) tube zithers
  312.121   Without extra resonator
  312.122   With extra resonator
  312.2   Half-tube zithers
  312.21   Idiochord half-tube zithers
  312.22   Heterochord half-tube zithers
  313   Raft zithers
  313.1   Idiochord raft zithers
  313.2   Heterochord raft zithers
  314   Board zithers
  314.1   True board zithers
  314.11   Without resonator
  314.12   With resonator
  314.121   With resonator bowl
  314.122   With resonator box (box zither)
  314.2   Board zither variations
  314.21   Ground zithers
  314.22   Harp zithers
  315   Trough zithers
  315.1   Without resonator
  315.2   With resonator
  316   Frame zithers
  316.1   Without resonator
  316.2   With resonator
  32   Composite chordophones
  321   Lutes
  321.1   Bow lutes [pluriarc]
  321.2   Yoke lutes or lyres
  321.21   Bowl lyres
  321.22   Box lyres
  321.3   Handle lutes
  321.31   Spike lutes
  321.311   Spike bowl lutes
  321.312   Spike box lutes or spike guitars
  321.313   Spike tube lutes
  321.32   Necked lutes
  321.321   Necked bowl lutes
  321.322   Necked box lutes or necked guitars
  322   Harps
  322.1   Open harps
  322.11   Arched harps
  322.12   Angular harps
  322.2   Frame harps
  322.21   Without tuning action
  322.211   Diatonic frame harps
  322.212   Chromatic frame harps
  322.212.1   With the strings in one plane
  322.212.2   With the strings in two planes crossing one another
  322.22   With tuning action
  322.221   With manual action
  322.222   With pedal action
  323   Harp lutes
  4   AEROPHONES
  41   Free aerophones
  411   Displacement free aerophones
  412   Interruptive free aerophones
  412.1   Idiophonic interruptive aerophones or reeds
  412.11   Concussion reeds
  412.12   Percussion reeds
  412.121   Individual percussion reeds
  412.122   Sets of percussion reeds
  412.13   Free reeds
  412.131   (Individual) free reeds
  412.132   Sets of free reeds
  412.14   Ribbon reeds
  412.2   Non-idiophonic interruptive instruments
  412.21   Rotating aerophones
  412.22   Whirling aerophones
  413   Plosive aerophones
  42   Wind instruments proper
  421   Edge instruments or flutes
  421.1   Flutes without duct
  421.11   End-blown flutes
  421.111   (Single) end-blown flutes
  421.111.1   Open single end-blown flutes
  421.111.11   Without fingerholes
  421.111.12   With fingerholes
  421.111.2   Stopped single end-blown flutes
  421.111.21   Without fingerholes
  421.111.22   With fingerholes
  421.112   Sets of end-blown flutes or panpipes
  421.112.1   Open panpipes
  421.112.11   Open (raft) panpipes
  421.112.12   Open bundle (pan-) pipes
  421.112.2   Stopped panpipes
  421.112.3   Mixed open and stopped panpipes
  421.12   Side-blown flutes
  421.121   (Single) side-blown flutes
  421.121.1   Open side-blown flutes
  421.121.11   Without fingerholes
  421.121.12   With fingerholes
  421.121.2   Partly-stopped side-blown flutes
  421.121.3   Stopped side-blown flutes
  421.121.31   Without fingerholes
  421.121.311   With fixed stopped lower end
  421.121.312   With adjustable stopped lower end (piston flutes)
  421.121.32   With fingerholes
  421.122   Sets of side-blown flutes
  421.122.1   Sets of open slide-blown flutes
  421.122.2   Sets of stopped side-blown flutes
  421.13   Vessel flutes (without distinct beak)
  421.2   Flutes with duct or duct flutes
  421.21   Flutes with external duct
  421.211   (Single) flutes with external duct
  421.211.1   Open flutes with external duct
  421.211.11   Without fingerholes
  421.211.12   With fingerholes
  421.211.2   Partly-stopped flutes with external duct
  421.211.3   Stopped flutes with external duct
  421.212   Sets of flute with external duct
  421.22   Flutes with internal duct
  421.221   (Single) flutes with internal duct
  421.221.1   Open flutes with internal duct
  421.221.11   Without fingerholes
  421.221.12   With fingerholes
  421.221.2   Partly-stopped flute with internal duct
  421.221.3   Stopped flutes with internal duct
  421.221.31   Without fingerholes
  421.221.311   With fixed stopped lower end
  421.221.312   With adjustable stopped lower end
  421.221.4   Vessel flutes with duct
  421.221.41   Without fingerholes
  421.221.42   With fingerholes
  421.222   Sets of flutes with internal duct
  421.222.1   Sets of open flutes with internal duct
  421.222.11   Without fingerholes
  421.222.12   With fingerholes
  421.222.2   Sets of partly-stopped flutes with internal duct
  421.222.3   Sets of stopped flutes with internal duct
  422   Reedpipes
  422.1   Oboes
  422.11   (Single) oboes
  422.111   With cylindrical bore
  422.111.1   Without fingerholes
  422.111.2   With fingerholes
  422.112   With conical bore
  422.12   Sets of oboes
  422.121   With cylindrical bore
  422.122   With conical bore
  422.2   Clarinets
  422.21   (Single) clarinets
  422.211   With cylindrical bore
  422.211.1   Without fingerholes
  422.211.2   With fingerholes
  422.212   With conical bore
  422.22   Sets of clarinets
  422.3   Reedpipes with free reeds
  422.31   Single pipes with free reed
  422.32   Double pipes with free reeds
  423   Trumpets
  423.1   Natural trumpets
  423.11   Conches
  423.111   End-blown
  423.111.1   Without mouthpiece
  423.111.2   With mouthpiece
  423.112   Side-blown
  423.12   Tubular trumpets
  423.121   End-blown trumpets
  423.121.1   End-blown straight trumpets
  423.121.11   Without mouthpiece
  423.121.12   With mouthpiece
  423.121.2   End-blown horns
  423.121.21   Without mouthpiece
  423.121.22   With mouthpiece
  </code></pre>
  
  <p>I don't want the actual numbers in the folder names. I just included them to illustrate the system of the hierarchy. I am using Directory Opus (pro version) if that helps. If not I will happily use any other software to achieve the same. No problem.</p>