When using our Online software please follow the steps below:

Sign in to your account and enter your return.
Go to the menu on the left side of the screen.
Click on Income then select T-Slips.
Now click on T-Slip Summary which opens the Income Slips screen.
Select T4 - Employment Income. 
Select I worked in Quebec and received a Relevé 1 slip.
Click Continue at the bottom of the screen.
When on the T4 screen click on Edit for the matching T4 for ___.
The amounts from your T4 slip will have been already there since you Auto-filled.
Scroll to the bottom of the page to reach Box E.
Enter the amount from Box E of your RL-1 in the field marked Québec tax deducted from your Relevé 1 slip (Non-resident of Québec).
Click on Save and Continue.
On the next screen, click on Done with T4.

Thank you for using TurboTax.

I've tried the steps above.  When I try to enter the amount from Box E of the Releve 1 at the bottom of the page the amount doesn't save. It disappears!  Can this amount be entered on the Releve 1 screen?