Please provide the option to make Character parts that are weight painted, "Sub-items" on Humanoid/Non Native Characters or allow us to separate merged items keeping it's weight painting and quad structure in tact.
In my previous post we (Myself and Rampa) discovered a problem with character complexity(many character items) and trying to create Facial morphs with the FPE (Facial Expression Editor) GoZ process:
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The workaround was to merge all non body parts in order to be able to use GoZ.. however, this introduces a BIG problem which is that the character items can no no longer be isolated for exclusive/controlled weight painting!!

In order to mitigate complex character creation process, parts should be able to be merged as Sub-items or allow us to separate the parts as skin weighted character parts/items *without* creating Tris as it's known in the mesh editor when separating.

The problem of dealing with complex characters sending over to Zbrush from within Facial Profile Editor might be an issue of CPUs For Example Rampa had reported to me that he was using an 12th generation i5 and I'm using an AMD 16 core/32 Thread @5GHz and 128 GB of ram - he was able to merge all non body parts all at once, I was only able to merge a few at a time or else CC4 would crash, maybe it's a memory leak/allocation issue dealing with AMD CPUs in CC4.