How to shift data from one tag field to another on the same file

Well basically i started using a new player, which uses the comment tag to display description. So basically i would like to batch convert my whole librarys description tag to the comment tag but keep it on the same file. Is there a way to do this in mp3tag or any other program? Thanks in advance.

You can use Convert → Tag - Tag for COMMENT using %description% as format string.

TY, i took way too long to not have figured that out.