Here is a simple and useful macro for MS Word which will update all of the linked cross-references in a document at once. A lifesaver!!
(This works for PC Word… haven't tested it for Mac. Let me know!)

Sub UpdateAll()
Dim oStory As Range
Dim oField As Field
For Each oStory In ActiveDocument.StoryRanges
For Each oField In oStory.Fields
Next oField
Next oStory
End Sub