To enter a Relevé 1 (RL-1) when you don’t live in Québec and are using TurboTax Online;
go to the Income Tab > click directly on T-Slips > check the T4 slip box > a dropdown appears "I worked in Quebec and received a Relevé 1 slip" which must be checked. You can then proceed and "enter a new T4 slip" or "edit" an existing one. Box E will appear near the bottom of the slip page.
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https://turbotax.community.intuit.ca/replies/3456106
I followed these steps in 2023, but the last step is not there. Clicking on T4 doesn't give a drop down but just sends me to the T4 page. I even have the box from a previous list "I worked in Quebec and received an RL-1" checked, but it didn't autofill an RL-1 (just the T4 from the Quebec company) and it's not giving me any options to add it either.
Oh, I figured it out. On the T4 slip, after you hit "edit", scroll all the way down until you see "Box E" and enter the amount there.