Hi, your requirement seems to be different from my understanding. Output types are required if you want to generate a print or send a IDoc.
But perhaps you want to update fields in the standard table. Is this the sales order table itself? If so, do your coding in the exit MV45AFZZ. You can use the correct subroutine there based on requirement, you can read the description of subroutine to understand. You just need to pass the value to the table field there.
If you want to update a different standard table, you might have to call a BAPI.
Output types are created and configured by functional consultants. You can ask your SD functional to create a Z one.