GrandmaT, with the exception of the files in /data and /runtime/textures and /runtime/geometry, pretty much everything else is scripts to load the contents of those directories into the scene. So it is imperative that you do not change those three folder names or move stuff around in them because the program uses relative paths to find them. If you move those around or rename them you will get an unending string of "file not found" messages. As long as you are not using smartcontent which depends on database entries, you can move pretty much everything else anywhere you desire, and I usually do. The "/data" directory is essentially DAZ's version of the two runtime folders I mentioned in that it has all the geometry files and texture files in it (as well as other things like morphs).

So in the root of MyLibrary (or whatever else you have pointed to as a DAZ library) you should have exactly one /data and one /runtime, and any content you have with those folder names should be merged into those folders. If you have a /data or /runtime at any other level in the directory structure, it will not operate properly.

Poser Native content has a few more rules, I don't want to complicate things for you at the moment, but all the poser scripts are at the /runtime/library/(one of six subfolders) level. Moving those outside of that structure renders poser files unusable in DAZ