Items are related to design parts to establish where an item belongs and where it is used within the product. An item is either owned or used by a design part. Only one design part can own an item, but several design parts can use it. Item-design part relationships apply to all revisions of the item.
Item-design part relationships are:
Owned. A single design part can own any number of items. This relationship indicates the part of the product in which the item belongs.
Used. An item can be used by any number of design parts. This relationship indicates that the item is reused in different parts of the product.
Example: A Reused Item
The item Logo.gif, which is the company logo bitmap in the product Sales, is owned by the design part Docs and is also used by design part GUI.