How to copy part of a field and paste in another field

Hello Forum! Everyone has been so supportive here, THANKS!

I have a ton of songs with the "Artist & Title" in the Title Field. (Bad Company - Rock n Roll Fantasy)
I would like to cut the Artist (Bad Company) and remove the two spaces and dash, then paste the Artist name (Bad Company) in the Artist Field. I need to do this in a large batch.

Action: Format Values
Source Format: %title%
Guessing Patteren: %artist% - %title%