Operation Specific Quantity

I hope I can find the answer im looking for. Is there a way to make an operation in a job a specific quantity that is different than the whole lot. Example is if we have 100pcs and 2 of the pieces need some rework done we are being told we have to split the whole job. Im hoping there is a way to add the operations to the existing job for just those certain pieces. Doing it the splitting way will cause a nightmare for everyone involved. Thanks