Use Excel VBA to operate on selected text in Word 2013

[GCW esq]

I want to have Excel VBA select text in a Word doc, and delete bookmarks, and in some cases contents of bookmarks, in only that selected text.
I tried the following, but it works on the whole document, not on the selected text only.

Dim Bkm As Bookmark
ActiveDocument.Bookmarks("MyBookmarkName").Select
   .Bookmarks("MyBookmarkName").Delete
    
'Other Code - this deletes some of the bookmarks and some contents.
'The following deletes the contents of any remaining bookmarks, including those outside the selected text.

For Each Bkm In ActiveDocument.Bookmarks
    Bkm.Range.Delete
Next Bkm

Thanks for any help.