How do I copy Number from Filename to Track

01 Filename.mp3 would have the Track field populated with 01

101 ArtistExample - NameExample.mp3 would have the Track field populated with 101

Filename - Tag (ALT + 2, or Convert, Filename - Tag)

Filename is: 101 ArtistExample - NameExample.mp3
Format string: %track% %artist% - %title%

Edit: If you only want the Track Number filled in you use

Format String: %track% %dummy% - %dummy%
or even shorter: %track% %dummy%

YES!
Thank you so very much, Mike_nl!

This is important because I was in a car rental and the car radio would only play files in alphabetical order unless track order numbers were in the tag, it completely ignored numbers from the file name... So with this, all file name numbers are transferred to a tag, resolving this problem...

My car actually observes filename numbers if there are no Track numbers... but other car stereos do not... so having Track numbers in the tag is important.

• To assign NUMBER from Filename to Track
ALT+2
%track% %dummy%

You can assign an Actions groups shortcut:
Actions > Actions > New [upper right yellow star icon] > Name the action
NUMBER from Filename to Track

New [upper right yellow star icon] > Select: Guess values > OK >
Source format: %_Filename%
Guessing pattern: %track% %dummy%