composer tags from artist names

Hi there, I have a list of classic mp3s here.
I would like to add composer tags. As far as
players were VA ripper program used composers
as artists. so is there any way to achive something like

%artists=composers% ? cause when I try its not working:)
I dont want to ruin artist tags, but want to duplicate the same
name in Composer tag:)

thanx in advannce



create a new action

action: format value
format: %artist%

thank you very much!