Just double click on line 14 Iowa Schedule A creating a statement.  On statement line 1 type federal cash contributions and amount carried forward from feds.  On 2nd line type Univ of Iowa @ 80% and the amount.  You do the exact opposite for contributions such as STO's and IA Endow contributions which are deductible for federal but not Iowa.  In those cases 2nd line amount would be a negative labeled "less IA STO."