The objects that you select from the selected xref or block are temporarily extracted
and made available for editing in the current drawing. The set of extracted objects
is called the working set, which can be modified and then saved back to update the
xref or block definition.

The following prompt is displayed.

Select reference

Select an xref or a block in the current drawing.

If you edit an xref when the ribbon is active, the Edit Reference ribbon contextual
tab displays.

If you enter -refedit at the Command prompt, options are displayed.