with the uv map shown you can paint a texture that includes both parts on a single map. That means you can have whatever you can paint.  It would be difficult to make different node based textures but might be possible if you can restrict the uv range for each.

 

Poser does not have the ability to uv map anything.

You can not have a single map that includes more than one object. If the cube and cone are seperate objects you need two maps.