Cmdlette

Here is my situation: I have 1 WIM file called Windows7x64.wim Inside that wim I have two images: Win7x64-FieldDevice and Win7x64-Desktop These two images have different answer files with different settings contained within. I want to create an offline USB media that contains this wim/2images. The trouble is I need TWO answer files for this to work. My questions are this... Can I have two answer files on USB media taking into account the above situation? OR can I combine my two answer files into one, but still maintain the different settings for the Desktop v. FieldDevice image?