You cannot remove it from
MDE but you can deactivate it and thus accomplish the same thing you want to accomplish. When you go on MDE, sign in, and then get to main page where you can click MyDisneyExperience on the top right and get list of links, there is a link "Magic Bands and Cards." Go there. You should see your guest list, and you should see for each quest, who has tickets, cards with numbers. Find the cards there with your ticket numbers that you want to deactivate and click on them and deactivate them. That renders them unusable until you choose to reactivate them. When you use your magic band to enter a park they won't show up as connected to the magic band.