Field.Unlink Method (Publisher)
Replaces the specified field or Fields collection with with their most recent results.
expression A variable that represents a Field object.
When you unlink a field, its current result is converted to text or a graphic and can no longer be updated automatically.
This example unlinks the first field in shape one on the first page of the active publication.
ActiveDocument.Pages(1).Shapes(1) _ .TextFrame.TextRange.Fields(1).Unlink