After I discovered you can run multiple instances of AM I came up with a way to build a library (sort of) of e.g. drum kits or drum (or bass) patterns. But you can also use this method to "insert" often used combinations of contraptions (call them "subpatches" if you like).
Just create (an) AM document(s) in which you place your favorite stuff, save it.
Later on (when working on a project), you can open a second instance of AM and open a "library document" in order to simply COPY & PASTE your stuff to your Project.
Simple as that! Have fun mulching!