Merge tags

Hi all. How do i merge 2 tags to one. I have a tag called album and the extra part i need to add is in tracks. I need to add tracks to album to make a complete tag. Any help would be appreciated.

See the FAQs for that: /t/967/1

I think the string that you need would look something like this:
%album% _ $num(%track%,2)

I wonder if you really mean ALBUM or whether it would rather be TITLE that should be appended.
Usually, a track number applies to the individual title and not the album.