Another vbulletin skinning question

Okay I have figured out how to change most of the templates for vbulletin. But one thing I dont understand. Is do yu have to apply your new template to each element and sub element.

ie Okay I changed the header and the footer. Now the middle part is the one that does not stay the same. On forum home it is cool. But when I go to lets say usercp. The middle is missing. D I have to apply the mid section to every part separately?

I hope that question is not confusing. It just feels like I am doing things the long way. There has to be an easier way. Like on master change then it trickles down to the sub objects.