so a couple questions on this.

would I then have 3 separate files. One as if they were MFJ and the other as if they were MFS.  For efiling would I efile only the Fed on one and only the states on the other two?

I wasn't sure why you say attached MFS 1040 to states.   I would have thought you attach the MFJ to the states as that is what was filed.  Is the 1040 just attached using as a PDF, then?

Thanks for the help!!