copy to a tag and remove some characters


I'm a new user of The Universal Tag Editor.
Ihe some files without any tag !!!!
I've just the filename : for exemple 01 - mymusic.mp3.
I saw, I can replace the Title with the Filename (Convert Filename->tag %title%)
and I obtain 01 - mymusic
But How can I remove the first n Characters to Obtain 'mymusic'
There is the function $Cutleft(x,5), but I don't know how to use it.
Thanks for your help, and congratulations for your works

At Convert > Filename - tag use
%track% - %title%
%dummy% - %title%

Hello Dano.
Thanks for your help. %track%-%title% and %dummy%-%title% work perfectly.
Many thanks again