Add a Ship To State Under Main Section of Sales Order Form

Please navigate to Setup > Customization > Transaction Body Fields > New

1) Enter Label Name

2) Select Type as List/Record

3) Select List/Record as State

4) Under Applies To tab > Enable Sale

5) Under the Display Tab > Subtab > Change to Main

6) Under the Sourcing & Filtering tab > Source List = Customer > Source From = State

7) Select Apply to forms