"Actions" variable questions

Is there a variable in Actions that can return the numerical place of a given song in a list of songs?

Also, how can I prepend the %track% variable with a number and a dash (like "02-") in an Action (to indicate, for example, the disc number in a multi-disc set)?

Thank you.

there is the variable %_counter% that counts each file in a set of selected files.

see the FAQs: Actions and batch-operations

Yet, I would not do that as the field TRACK is defined as being numeric with the exception of the / to separate the total number.