Combine XFA PDF documents

Hi All,

I have a few XFA PDF documents. Each of them has dynamic sub-forms and XML data. 

I'm trying to find a solution to combine them into one DPF. After combining them, it can be static content. The most important thing is to render XFA forms using templates and XML data (to have the same view as a user opens it using Acrobat Reader) and join the results from multiple documents into one. 

Can someone propose any solutions to deal with it?