Blended vs Non Blended Labour Cost Rates

Summary:

We have a business requirement to maintain 2 separate labour cost rate schedules.
One with a blended cost rate used (overheads included) in Billable projects whilst and the second, a non-blended cost rate exclusively used in Capital projects. This is due to the fact that overheads cannot be capitalised. The only solution I can think of is to create labour cost over-rides but this is complicates projects setup.
Has anyone come across a similar requirement and are there any simpler solution for this requirement?

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