In the Object Types main window, select the object type whose details you want to copy in the navigation pane or the content pane.
Click the Copy button: 
The Copy Object Type dialog box appears.
On the General tab, enter the name of the new object type in the Name field, and optionally change the existing description in the Description field.
Under the Extended Copy options, choose the additional sets of details you want to copy from the selected object type to the new object type.
If you are copying an item, request, or project type, complete the Options tab as necessary.
If you want the dialog box to remain open after copying the object type, select the Keep Open check box.
Click OK to commit the details.