There are two sets of channels. Community channels, PBMCC, which are used by the community for custom morphs and DAZ channels, PBMDC, which are for DAZ use and could be used in some of DAZ's morphs so you stay away from those because you could overwrite one of DAZ's morphs with your own. To keep from overwriting DAZ's products, you only use PBMCC, with limits you to only 50 morphs... and probably less than that because other vendors could use those one of those channels as well.

That's why if you have a large number of morphs to add to a product, you create your own, hence was why I suggested ExP to you, which would work in both DS and Poser.