Membership to Multiple Groups 
vBulletin users can belong to multiple usergroups. Assigning a user to more than one usergroup is a way to create a unique set of permissions for the user.

For example, you might have a user who belongs to group X, but needs to have access to the few extra options (such as attaching files to posts) given by group Y. You can make X this user’s primary group and make Y a secondary group.

If a user is in multiple usergroups that have conflicting permission settings, the “greater” permission overrides the “lesser.” A Yes always overrides a No, and a larger number overrides a smaller one.
Note:
If 0 represents “unlimited” or “no” restriction, it overrides all other settings.
Warning:
Be careful when you put a user in a secondary group that you also use as a primary group. You might edit the group and inadvertently give the secondary user more permissions than you originally meant to!
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