Hi there Syn. So, unfortunately there is no such feature, no. Once a code is entered, it is there forever.
However, there is good news. To start, you can just re-enter the collector's card codes on your other Bungie.net account and you'll have all of them on there. The second bit of good news is that even though the Beta is on your other Bnet account, the three codes that you will get tomorrow (or the 23rd for Xbox) are not going to be limited to any particular PSN/XBL account. So as long as you can log into that other Bnet account, you can still enter those Beta codes on any gamertag/PSN account you want. So there's no problem here!
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Actually, there is a problem. I have an xbox based account on here and a google account, and now all of my card codes that I had collected and entered on my google based account are not on my (actively using beta) microsoft account. Tried merging the two, but it says you need to unlink the account before you can link it. So how does one do that?
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[url=http://www.bungie.net/en/Forum/Post/64336042/0/0]Click here[/url] and follow the directions under the appropriate section. And again, you can enter those 17 codes on the other account if you want- they can be used an infinite number of times.