MX REQUEST: allow the user to archive portions of a MODEL!

Often I find myself taking a standard demo model and building completely new structures for a specific customer/demo.  I start from a standard demo model so I can reuse structures and concepts from it.
Then, when I am done, I want to keep only the new stuff and any basic structures/data that I ended up using.It would be amazing if I could specify (perhaps using the Model Map) lists and modules and have them be “archived” while still keeping the model active.Right now I end up either archiving the whole thing (meaning it isn’t there when a subsequent demo could use a peek into what I did there) or I go through and try to delete stuff that I don’t need in there as I still have it in the original.