Do you mean install a new state in your program, or add another state that youve already installed, to a clients return?

Select goto state, then pick the 2nd state you need. (Helps to download and install it first if you haven’t already

First, if you haven't already, you must select and download that state.

Then, on the Info Wks >>Part VI Electronic Filing>>> Select state and city returns to file...and just use as many of the dropdown boxes as you need.