Sorry but the ONLINE program is not so sophisticated ... you must split all the deductions yourself. And it will not show your return at all ...it only shows the primary taxpayers return .... to do your return you have to start another account OR use the Downloaded version which has the ability to do "what if scenarios".
Be very careful now ... when you switch back to MFJ you must review all the screens to make sure all the income & expenses are under the correct spouses since that can cause other errors later.
https://ttlc.intuit.com/replies/3288477
https://ttlc.intuit.com/replies/4775330
