Combining XML and PDF Files

Hi, I have a form created in Adobe LiveCycle, and I need to be able to take this form and merge it with some PDF forms.  When I go try to "Combine Files into PDF" It says the XML form cannot be combine.  Is there a way around this?  Using the "Create a Portfolio" is not an option.

I have Adobe Pro X

Thanks for any assistance you can give on this matter.

Connie Bretes