If you have poser 4, you don't need to write a hierarchy file -- use the hierachy editor in the program. If the parts to your figure are named with the standard names, the editor will automatically organize them for you. The manual explains all this, but sometimes can be a little obtuse. (Both the grouping tools and the joint editor drew forth much colorful language from me at first, but now I'm starting to get the hang of it.) Just keep at it and don't give up. Also, try looking at some of the tutorials available on this site. They might give you further insights, or say things in a way that make it easier for you to understand.