TCJA took away the deduction for union dues back in 2018. Some states still allow them, so they get entered in the same place as usual (misc itemized deductions, unreimbursed employee business expenses, Sch A)....you just wont see any deduction for them on the federal return.
when i read posts like the OP made... i just think I should probably double my fees. Why don't they let people buy a software package and then perform brain surgery? smh
"My" union dues would go into a Turbo Tax return, here:
Your Client's union dues would be a different issue.
"Level Up" is a gaming function, not a real life function.