How to convert disc to track number

Hi

I have the disc no as 01 0r 1/2 for all multiple cd albums. Does anyone have a suggestion of how I can add the disc no to the tack number.

ie T=forever
tr=01
dn=5/5 ( 5 of 5 discs) in some cases I just have 05

to

T=forever
tr=501

Thanks

This is possible by using an action Format value

Field: TRACK
Formatstring: $num(%discnumber%,1)$num(%track%,2)