move a part of tag to another tag

I have a title tag like this: title (genre)
How can I move word between () to correct tag?

Example:
now is
title = La Cumparsita (valzer)

correct in:
title = La Cumparsita
genre = Valzer

Create a user-defined action (see /t/967/1 of the type "Guess value"
for Title
as mask enter
%title% (%genre%)

Perfect. Thank you very much!!! :rolleyes: