Range.PreviousBookmarkID Property (Word)

Returns the number of the last bookmark that starts before or at the same place as the specified range. Read-only Long.

expression .PreviousBookmarkID

expression A variable that represents a Range object.

This property returns 0 (zero) if there is no corresponding bookmark

This example displays the name of the bookmark that precedes the second paragraph.

num = ActiveDocument.Paragraphs(2).Range.PreviousBookmarkID 
If num <> 0 Then MsgBox ActiveDocument.Content.Bookmarks(num).Name