How can I "link" different files to my folder without using soft link? I have some some folders look like this structure:


Buy folder -> state_diagram_for_buy, activity_diagram_for_buy 
Sell folder -> state_diagram_for_sell, activity_diagram_for_sell
Search folder -> state_diagram_for_search, activity_diagram_for_search


I want to group all the state_diagrams and activity diagrams in two folder.
So one folder is used to store state_diagram and another one is used to store the activity diagrams.

However, I don't want to copy those file, since any changes in the original files cannot reflect on the copy one. I know there is a Unix command: ln can be used to create the linking. But are there other ways to create the linkings in finder because I don't know to type the commands many time...
You can create a smart search for each type of file. Make a search in Finder by file name (you can also enter other criteria) and when you're satisfied with the results, save it.