What happens if a deduction is part of a shared group with a limit, and a different calendar year limit is entered for that deduction on the employee card?  

For example, on 401k deductions, I have a code for pre-tax traditional 401k and one for after-tax Roth 401k.  I setup the shared deduction max at $19,000 (for 2019).  However, for those employees who are age 50 and over (who can contribute an additional $6,000) can I set the calendar year maximum one that individual's deduction to $25,000 (for 2019, $19k + $6k)?