Setup garnishments to deduct from separate chck & other garns not to deduct from sep chk

PeopleSoft 9.2

We process various payments on separate checks and when we pay employees more than one paycheck garnishments apply to each check.  This is correct for garnishments that are set up with a percentage such as a writ, but not for a garnishment set up for flat amount.  We currently have to manually remove the flat amount garnishment from the separate check.  Can we setup one garnishment deduction that applies to separate checks, and a second garnishment deduction that does not apply to the separate checks?