Hi Shrau,
1.Overhead costs:
If over costs based on material consumption cost elements:
Create a production/process order and issue materials (MIGO/MB1A) to production/process order. then execute KGI2 transaction.
If over costs based on labor activities cost elements:
Create a production/process order and confirm production labor CO11N/COR6N to production/process order. then execute KGI2 transaction.
2.Additive costs:
Create a production/process order and enter a Jounral entry (FB01/FB50) using additive cost elements to production/process order.
If additive cost based on purchase order functionality,create a purchase orde,MIGO and MIRO.
once these steps are executed,you will see additive costs on production/process order.
If you can not process production steps,take a PP consultant help.
hope this helps you.
Thanks,
Rau