I am a resident of Quebec, working in the province, and I received two T4's and one RL-1 from the same employer. When I try to manually enter the RL-1 slip on it's own, I cannot edit box C. I know that it's supposed to correspond with box 18 of the matching T4 slip but since there is no corresponding T4 slip, I need to know how to manually enter the amount into TurboTax that I have on my RL-1. Any help would be much appreciated.

(I don't understand why you can't enter these slips separately from each other. I always have to go in and edit the RL-1 anyways, so why not have an option to add it separately?)