Yes. Most changes increase costs, but sometimes a change has a negative cost — meaning that the scope delivered is less than originally agreed.
Typical example: the client reduces the scope, and the reduction is passed on to the subcontractor. The subcontractor then has to deliver less than the contract assumed, and the cost goes down.
How to register a negative cost
Create a regular Change Order Sub and enter a negative amount in the Cost field on the cost line. As with other Change Order Subs, the amount in Cost counts in the final forecast regardless of status.
The difference between a negative Change Order Sub and a counter claim
A negative Change Order Sub is not the same as a Counter Claim:
Negative Change Order Sub — an actual reduction in scope. The amount is registered as negative in the Cost field.
Counter Claim — a separate object for claims you raise against the subcontractor, e.g. because they have not delivered as agreed. The amount is registered as positive and is deducted from the final forecast.
Read more in Counter Claim.