Basic Concept: Inheritance 
The most important concept in vBulletin’s permission system is inheritance. There are several levels at which you may specify usergroup permissions.

The first is at a global level. These permissions can be edited by going to Usergroups > Usergroup Manager > Edit Usergroup.

The permissions you specify here will be used everywhere on the board unless you override them at the forum level. Forum-level permissions can be edited by going to Usergroup > Forum Permissions. Permissions you specify for a forum will also automatically inherit to any child forums, unless overridden there and so on.

Each of these areas will be discussed in detail in the following sections.
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