Is there a way to change the Total Contribution Margin/Base calculation shown on Customer Orders? Right now it’s taking total net amount minus total cost. Is there a way to change it so it only subtracts fixed cost?

Is there a way to change the Total Contribution Margin/Base calculation shown on Customer Orders? Right now it’s taking total net amount minus total cost. Is there a way to change it so it only subtracts fixed cost?
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