Nontaxable pension tax bracket

I'm using the Tax Planner so setting the correct tax brackets on transactions is important to me.
My employer pension payments have a taxable, nontaxable, state and federal tax amounts. For the nontaxable category I've created what tax line item should I use? There isn't one that specifically states for nontaxable so the only one that might be used is 1099-R:Total pension gross distrib. I'm not sure because if I use that item it wouldn't represent the full gross amount only the nontaxable portion.


I guess the other option is to not assign a tax bracket to the category.