To call up the
Change External Xref Dialog, choose or click the
Insert External Xref button
on the toolbar.
The Change External Xref Dialog will appear.
Figure 1. Change External Xref Dialog.

To change the target of the xref from external to local, click the Local Xref tab.
In the Change Local Xref Dialog, select the target from the Targets list.

You can see the list of available targets in the current document.
To filter the targets by type, select a type from the Show types drop-down list.

You can also check the Close on Change checkbox, and then click the Change button.