I made a mistake and asked to add a second T4 and I want to opt out of it and go back to my original T4. The program won't let me proceed.

Thank you for your question.

You won't have choice. You will need to put any amount on box 14 and put a province on box 10 and save it.

After, on the T4 summary, you will need to erase this slip.

Have a good day.