I did once write a Word macro that extracts the comments to a separate document, you are welcome to try adapting this to your purposes, if you have trouble then reply here and I can give you a hand with making changes.
Public Sub PROCESS_COMMENTS()
Dim strReplaceText As String
Dim myPar As Paragraph
Dim strCurrentColumn As String
Dim i As Integer
Dim Com As Comment
Application.ScreenUpdating = False
' set the input and output docs.
Set inDoc = ActiveDocument
' check we have comments to process in the original document
If inDoc.Comments.Count < 1 Then
MsgBox "No comments in the document"
Exit Sub
End If
' comments exist so create new document
Set outDoc = Documents.Add
Set outRange = outDoc.Content
outDoc.Range.InsertAfter "List of Comments:"
outDoc.Paragraphs(outDoc.Paragraphs.Count).Style = outDoc.Styles("Heading 1")
outDoc.Range.InsertParagraphAfter
' cycle through comments, inserting them in the new document
' display the new document and refresh
outDoc.Activate
Application.ScreenRefresh
For Each Com In inDoc.Comments
outRange.InsertAfter "[" & Com.Author & " - " & Com.Initial & Com.Index & "] "
outDoc.Paragraphs(outDoc.Paragraphs.Count).Range.Font.Bold = True
outDoc.Range.InsertParagraphAfter
outRange.InsertAfter Com.Range.Text
outDoc.Paragraphs(outDoc.Paragraphs.Count).Range.Font.Bold = False
Set myRange = Com.Scope
outDoc.Range.InsertParagraphAfter
outDoc.Range.InsertParagraphAfter
Next
Application.ScreenUpdating = True
Set outDoc = ActiveDocument
End Sub