How to customize dropdown items depend on the user security group?

Hello,

I am newbie  to suger Crm , I am wondering how can I customize the sales stage drop down in opportunity model for example , so if user A from the security group SALES1 can see only the 3 options (Prospecting, Qualification, Needs Analysis) , if another users (user B) from security group SALES2 can see the whole list.

Thank you,

Hafez