Ability to merge / spread proc groups

[SaculRennorb]

I've run into this quite a few times now, so i'm turning it into a request;

I would love the ability to "merge" procedure groups into other procedure groups. Not automatically, but explicitly.

I've Originally run into the need for this when overloading the "intrinsic" make and delete groups. Currently you have to list every individual member of the original group, even if you probably only want to add one more member. This gets even worse if you try to do this hierarchically, which forces you to re-list increasing amounts of members.

Usage Example / Syntax idea:

my_procs_1 :: proc { proc1, proc2, proc3 }
my_procs_2 :: proc { ..my_procs_1, proc4, proc5 }