Prepare the federal joint return, coding everything as T,S, J.

Then split into MFS. Check everything carefully. Prepare the CT returns from the MFS files.

Thank you! The taxpayer is to file CT part year/nonresident tax return and the spouse is a full year resident.  Should I make a copy of their file and do the MFS from that file? I guess I would have to make two copies so I can input the spouse's information from the second copy, the husband's and file the two state returns from those files.  File the federal from the original.  I am guessing this cannot be done electronically.

There is an option to split a MFJ file into 2 MFS files 

https://accountants.intuit.com/support/en-us/help-article/tax-filing-status/split-married-filing-joi...

Thank you so much!