I want to combine my files into one so how do I do that? For example I'm making an epm and I've created seperated files for each sections of the epm so I want to combine them into one.
What you're talking about sounds like a DITAMap or other such 'container' document.
Depending on what doctypes you are using for the electronic parts, there should be a map document for them.
If not, one would need to be created.
Please let us know if you have more questions on this issue, or if you're all set.