If a type is a sysobject or subtype of sysobject, you can convert the type to a shareable type, even if its supertype is shareable. However, you cannot convert a type to shareable if any of its children are shareable types. This option is available only on 6.5 repositories where the High-Volume Server license is enabled.
To convert a type to a shareable object type:
Navigate to Administration > Types to access the Types list page.
A list of existing object types is displayed.
Select the type to share and then select Tools > Convert to sharable object type.
The Convert Object page is displayed.
Click OK to convert the object to a shareable object type or click Cancel.