How do i reassign an already scheduled meeting under one license to another license ?

[Vision12]

I had one license and erroneously scheduled two different meetings at the same day and time.  I learned i need two licenses, so i now have my second license.   

How to i reassign one of those two meetings to the second license so i can have both meetings going at the same time without any problems.  They will be two separate meetings going at same time