To change an external conref into a local conref, do the following:
To call up the
Change External Conref Dialog, choose or click the
Insert External Conref button
on the toolbar.
To change the external conref into local, click the Local Conref tab.
In the Change Local Conref 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.