ProConnect Tax doesn't have the split MFJ function that exists in Lacerte.  I'd use the MFJ vs MFS comparison as the starting point then following Steps 1 to 6 outlined in this thread - but be forewarned that's a very manual process that may not be worth the effort, depending on the complexity of your return:

https://proconnect.intuit.com/community/proconnect-tax-discussions/discussion/re-how-to-create-the-c...

Here's a discussion that's more in line with your context but it leads back to the same thread I posted above.

https://proconnect.intuit.com/community/proconnect-tax-discussions/discussion/how-do-i-split-a-feder...

Thank you. I appreciate your help.

NP, @dndngh!  Have a great day.