After you have filled out the 1st T4 slip, click on “Save T4 & Enter Relevé 1” at the bottom right of the page. Enter the Relevé 1 associated with the T4, then click on “Save & Continue”. Then on the T4 Summary page, click on “Add T4 – Relevé 1 for [Your Name]”. Enter the 2nd T4 and click on “Save T4 and Skip Relevé 1”.