Adding new tags and delete old ones from file name

Hi everybody,
when I add a tag, Hazel will automatically add it into the name file, at the beginning of this one like this :
Tag - File name - extension
when I modify the tag or add a new one, I get this :
(new) Tag - (old) Tag - File name - extension
How can I ask Hazel to first delete old tag from the file name ?
Thanks for your help
when I add a tag, Hazel will automatically add it into the name file, at the beginning of this one like this :
Tag - File name - extension
when I modify the tag or add a new one, I get this :
(new) Tag - (old) Tag - File name - extension
How can I ask Hazel to first delete old tag from the file name ?
Thanks for your help