Project costing reports, is there a way to have a report set up that will exclude certain cost codes?

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Hi,

We run projects through Sage and our project manager likes to receive reports with the cost codes with detail, we have set up a report for this.

However he has said he wants to continue using the existing report but with two of the costs excluded. 

I have tried playing in report designer but it seems to me that Sage will only ever pick up data such as COST CODE, you can seem to edit the collecting of this data from the program to exclude certain codes. 

I'm guessing the answer would be to set up a duplicate project and move these costs into that but the Project Manager would want all of the costs to remain in the project but only to be excluded from the report we run for him, so this isn't really the answer.

I hope this makes some sort of sense!

Thank you