So, how do we get those morphs into our figure? Let's assume we are using some kind of morph injection, which seems a reasonable way to go. There are basically two problems:

1. We need to create the channels to inject those morphs into.
   2) We'd like to organize our morphs in logical groups so that we have a chance to find them later on.

Both problems are easy to solve if we use only one set of morphs from one creator at a time. We'll just add a number of blank channels to each actor into which the morphs inject, and the injection pose comes with an appropriate grouping for the morph set. Yay!

But with the blank channel model it is at some point inevitable that two morphs from different sets use the same channel. So we can't use those morphs together. Another problem is that whenever a pose file defines channel grouping in an actor, Poser throws away all existing grouping and starts over from scratch. So whichever pose file is loaded last gets its grouping, and everything else is thrown back into a flat list.

Obviously, since PMDs can create their own channels, they solve the first problem. But they don't solve the second. DAZ has a system that apparently solves both problems, but is quite complicated and from what little I've seen seems rather fragile.

-- I'm not mad at you, just Westphalian.