You *WILL* have two home offices (HOs) when done, listed on the return.
First, you must close the hold home office. The program asks something like "Did you stop using this asset in 2017?" Answer yes and work it through. Note that the date you stopped using it must be at least one day "BEFORE" you moved out. When it comes to your HO expenses, you only enter those expenses paid while that HO was open - usually the "whole house" expenses. So if you closed the HO on June 30th, you only enter your whole house expenses paid January through June.
When done closing the old HO, you will click the button to "Add Another Home Office" for the new residence. Note that your "in service" (start of use) date for the new home office must be at least one day "AFTER" you closed the old home office (those dates can't overlap) and must also be at least one day "AFTER" your move in date. Again, expenses for the new home office need to be those paid for the period of time *THAT* HO was open.
