Extracting Artist from filenames to Artist Column

[Winston1979]

So MP3tag has been an amazing programme, I feel like I'm pushing my luck with this question, is there a way to extract the info before the - and copy it to the the correct cell?

So to look like below, I've done this one manually.

Does this make sense?

[ohrenkino]

Try Convert>Filename-Tag
String: %artist% - %dummy%
or
%artist% - %title%

[Winston1979]

@ohrenkino

%artist% - %dummy%

Wow, just wow.

Thank you