The Custom tab of the Properties dialog box displays information about attribute and hyperlink customizations for the selected object.
An attribute is a metadata annotation attached to an object. Attributes take the form of a name-value pair in which the name is one of a list of user-defined attribute types and the value can be set by a user, subject to constraints specified when the attribute type was defined. On the Custom tab for a VOB, the Attributes box displays attributes of the VOB itself, not attributes of objects in the VOB.
When you right-click in the list of attributes, a shortcut menu appears with commands to add or delete an attribute, change its value, or display properties of the attribute type.
A hyperlink is an object that associates two other objects in the same VOB or in different VOBs. On the Custom properties tab for a VOB, the Hyperlinks box displays hyperlinks attached to the VOB itself, not hyperlinks attached to objects in the VOB.