remove or change mail to our syntax via csv upload

hi
i want when some of our admin when upload user csv , they can't use their email. for example when an admin upload csv of users to cb and userA has userA@yahoo.com , userB has userB@gmail.com , i want change from userA@yahoo.com to UsernameOfUserA@oursite.com and ....
i use some userAction code but nor work for me.
1-is there any trigger for after csv upload to cb which we can use that with auto action?
2-how to get email of user from csv? can i use substitution for that?
 

There's no functionality for that in the import process. It just imports literally what you provide it. Have them replace the emails in the CSV as desired before they import and it will do as you're wanting.

i use some userAction code but nor work for me.

I cannot help you in any way regarding paid products without an active subscription, sorry.