How to enter mortgage interest as deduction If I switched primary home?

Here is my case, I live in house A as primary home for first 9 months in 2024, then I bought another house B, and moved into the new house in October (lived for last 3 months of year).

 

I was trying to rent house A out once I moved out. But unfortunately, I was not able to find a tenant, and the house A was vacant for the last 3 months of the year. 

 

Since there is no rental income, I cannot claim house A as rental property in TurboTax Online.

 

Later on, in Deductions and Credits section , I am trying to enter the mortgage interest of primary home. I think the correct way is sum up the interests I paid for house A (the amount in the 1098 minus the interests I paid for this property in last 3 months of the year) and interests paid for house B.  Is my understanding correct? If so, how can I do that in TurboTax Online?