Cisco wlc question

Hello,

I have a question that I hope someone can answer. We have a Cisco wlc that has a quest network configured on it. I have been asked to update the certificate for this wireless network as the current cert is an old Symantec one that is no longer trusted and people struggle to connect. I have bought a new certificate and have read a bunch of guides on how to upload the new cert, but none of the guides say what to do with the old cert. So my question is what do we do with the old cert? Do we delete it somehow?

It is a 3rd party cert and it is still valid.