Field object: Replaces the specified field with its most recent result.
Fields object: Replaces all the fields in the Fields collection with their most recent results.
expression.Unlink
expression Required. An expression that returns a Field or Fields object.
Remarks
When you unlink a field, it's current result is converted to text or a graphic and can no longer be updated automatically. Note that some fields
Example
This example unlinks the first field in "Sales.doc."
Documents("Sales.doc").Fields(1).Unlink
This example updates and unlinks all the fields in the first section in the active document.
With ActiveDocument.Sections(1).Range.Fields
.Update
.Unlink
End With