Attached Link: Snowsultan's Freestuff

OK, what you'll find is that all Poser-ready figures have their own UV maps which were created for them.

The more complex humanoid figures such as V4 have several mapping groups, as you've discovered - V4 I believe has separate maps for her face, eyes, torso, legs and eyelashes. (Maybe more, I haven't made any textures for V4 yet.) Most modern figures have comparably complex mapping.

The good news is, most figures come with templates and the wonderful SnowSultan has made seam guides for all of the Daz figures. These are colour coded so you can work out which bit of the map has to match in order for the texture to be seamless.

OK now for more simply stuff that you want to map yourself...

When you create a new UV map in UVMapper, you have to save not only the map but also the remapped .obj file, as this holds the coordinates to apply your template. So for example, if you want to UV map the box from the Props>Primitives libary...

Import the original box.obj file into UV mapper (you'll find this under Poser 6(or7)/Runtime/Geometries/Props)
Create a new UV template (you'll want the "box" method, obviously, in this case, but you can try different mapping methods for different shapes)
Save the template as a .bmp file
Now save the model itself - give it a new name such as "mapped_box.obj"
When you have finished texturing your map, import your mapped_box.obj into Poser and apply the texture through the material room. You can now save it to the Props library if you want, too.

Hope this makes sense and helps :-)

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire