Assuming these are amounts taxable to your client as PY residents of IA and AZ, you'd make your input as follows:

• On the line for Taxable Amount, click on the + sign on the right of the input field;
• You'd create 3 entries in the pop-up box;
• Entry 1: Amount = 14,000; State = US; Source = N;
• Entry 2: Amount = 10,000; State = IA; Source = S; and
• Entry 3: Amount = 4,000; State = AZ; Source = S.

If your client was a resident of only one of the two states, however, the full amount should be taxable solely to that state.