Rotate Selection in Preview I am doing something I thought would be pretty easy, but apparently I was wrong.  

I am wanting to edit blueprints for my sister-in-law's new bathroom redesign.  I have made selections to the PNG with my rectangle tool for the shower, sinks, toilette, doors, etc., etc., 

I simply want to rotate these selections (not the entire imagine) 90°.  

Right clicking to rotate, does nothing.  Right clicking isn't allowed.  

When I try to go to tools-rotate left with the selection selected it flips the entire imagine with the selection along with it. 

I tried selecting the image, copying it to the clipboard and THEN rotating the imagine to get it to line up.  That too doesn't work as Preview clears clipboard every time I rotate the entire image.  

Surely I cannot be the only person wanting to do this. I am running 10.11.6
Copy the selection.
Open the selection in a new document.
Rotate the new document.
Select and copy the new document.
Paste the new document into the original.
Re-position.