Adjusting for vacancy when modeling a multi-family transaction in Valuate starts with the rent roll assumptions. Because Valuate assumes that any vacancy will be an adjustment to your Gross Potential Rent, you'll need to make all unit rental assumption inputs first.
If you have already added your unit rental assumptions on the Rent Roll screen, then go to the Cash Flow screen and scroll down to the Gross Rent Deductions section.
The Gross Rent Deductions section allows you to make annual inputs for vacancy loss for your deals entire assumed hold period.
The Cash Flow screen allows you to see the impact of your vacancy assumptions on an annual or monthly basis. To see how you can make these adjustments.