I've never done it but I did see some options for it the other day.
Log in to your e-ticketing account.
Find your 25/26 ST in the Season Ticket Packages section.
Push the little square with an arrow on it bottom right.
Should take you to another screen where if you scroll down you should see individual matches listed with upgrade your seat and convert to match ticket + transfer options.
I haven't gone any further than that so don't know if the person you're transferring to needs an account as well or not.