How to separate Capex & Opex WBSs

Hi Gurus,

Please can you knidly share how other companies differentiate between Capex & Opex WBSs?

We normally have some Capex & some Opex WBS under one Project Profile. So we need different validations & user input depending on if it is Capex or Opex WBS.

Ideally, we would have user just choosing between Capex or Opex option & all validations & diffrence in required input to follow.

Currently we use Field Keys for this & later refer to them in a validations. This has lots of disadvantages, so I wonder how other companies do it.

Thank you!