CP form linked to Laycan cancelling

We would like to be able to program and link certain CP forms (under CP Terms window) to the laycan to (cancelling) time i.e. Asbatankvoy cancelling time is by default always 16:00hrs, so we would like to have IMOS linking both fields, whenever Asbatankvoy is selected in the CP form, we would like IMOS to populate the "Laycan to" time filed automatically, keeping the option to edit it in case it was agreed a different cancelling time.