You can use a formula to combine deductions on your check stub.
Use the following formulas as an example for combining deductions for Current check and YTD amounts.
Note: For the purpose of the example formulas below, the deduction IDs we are combining are HEALTH and HEALTH2.
Current Check Deductions:
Lookup(Amount [PR Check Deduct],Employee[PR Check],Period End Date[PR Check],Check Sequence[PR Check],"HEALTH") + Lookup(Amount[PR Check Deduct],Employee[PR Check],Period End Date[PR Check],Check Sequence[PR Check],"HEALTH2")
YTD Deduction Amount:
Lookup(YTD Deduction[PR Employee Deduct],Employee[PR Check],"HEALTH") + Lookup(YTD Deduction[PR Employee Deduct],Employee[PR Check],"HEALTH2")