action replace title with blank how ?

hi

i need a help

look this a title

a song name - example.com

i wants to title this

a song name

how removed example.com

i can not do this please help me

I am sure you could do this: simply edit the field.
If you want to automate the process it is not quite clear if example.com is a string constant or whether it could vary.

To remove " - example.com"
Create an action of the type "Replace" for TITLE
Search string: - example.com
Replace string:
(leave empty)

If you want to remove everything after the "-" then use an action of the type
"Guess value" for TITLE
Guessing pattern: %title% - %dummy%