How to add estimated cost to PM - Misc cost - Job cost

Is there a way to add Misc. Costs on a PM schedule, task plan or Standard work order. I have a case where I would like to do a refurbishment on an asset every 5 years. We have an estimated job cost but not sure how to have that show up as a planned cost. I really did not want to have to add it as a Part in EAM. I only see where I can add planned labor or material list - parts but no where to put a misc. estimated cost or maybe an estimated job cost.