Can I add more or fewer SANs during renewal?

Multi-domain certificates can only be renewed with the same number of SANs (additional domains). There is no option to change the number of additional domains during checkout. However, there are two ways to add more additional domains to the renewal certificate:

Additional domains can be purchased from your SSL list > click on the certificate ID > click on "Add more" button in the "Secures X of 100 domains" line.