In Applications>Panorama>Extensions>Libraries, I have a folder called Matrices which contains several custom statements. In a folder nested several folders deep in Macintosh HD, I have the source folder, Matrices which was copied to the Libraries folder. I have third Matrices folder in a collection of files awaiting upload to Dropbox.
If I amend a procedure in any one of these, the same amendment appears in each of the others but, when I give them three different names, they become independent.
I guess this is more an item of interest than anything else because the solution is simple. The key probably lies in the fact that I copied the folder to Libraries rather than load each of a dozen procedures individually.