To Manage Group and User List Ownership

Open the User / Group Management dialog. (Tools > User Management)

To manage group ownership:

Expand All Groups, then select a group from the list.
Set Display Type to Members.
Current owners of this group have a star icon next to their name.
To make a user or user list an owner of the selected group, right-click the user or user list from either the Available list or the Assigned list, then select Set Owner.
To remove a user's or user list's ownership of the selected group, right-click any owner from either the Available list or the Assigned list, then select Remove Owner.

To manage user list ownership:

Expand All User Lists, then select a user list from the list.
Set Display Type to Members.
Current owners of this user list have a star icon next to their name.
To make a user or user list an owner of the selected user list, right-click the user or user list from either the Available list or the Assigned list, then select Set Owner.
To remove a user's or user list's ownership of the selected group, right-click any owner from either the Available list or the Assigned list, then select Remove Owner.

When finished making changes, click OK.

Note: If you were not able to make one of the selected users an owner of the group or user list, it is probably because that user's user setting Administrative > Enable group and user list ownership is not turned on. This is an administrative user setting and can only be turned on or off by your administrator in ProjectWise Administrator.