[CentOS] sudo

[centos at unixplanet.biz]

Hi

Biz_User needs to switch to Sales_User, and  I tried following in sudoers:
Biz_User ALL=(Sales_User) ALL

but I get following error when I run sudo su - Sales_User

"Sorry, user Biz_User is not allowed to execute '/usr/bin/su - Sales_User'
as root on Server_Name"

I know that if I add root in allowed users list, I can switch
to other user , but in that way user can switch to root as well.

%Biz_Users ALL=(Sales_User,root) ALL

any better idea ?