Tag code

Hi guys... BRAND New to tagging. I need a quick action code to rename my filename like the first trace in my list. I usually manually go through to rename
but I know there has got to be an easier way. Please help.

I need to change from just 01 - Trackname to 01-01 - trackname

What data do you have in the other fields? I can see only TITLE and that seems to be a mixture of TITLE and TRACK.
Perhaps you separate the data first and then rename the files with the function

If you insist to fiddle about with the filenames then you could also use the function
Source: %1 - %2
Target: %1-%1 - %2

Why do you need the leading number twice?