Your attempt with bookmark was quite good. You just need to extend your code a bit:
ActiveDocument.Bookmarks("combo1_bm").Range.Copy
....
Selection.Paste 'or different pasting procedure
Keep in mind that you don't need to select object before copy it. Just try doing as I show above. Moreover, don't miss quotation marks for names or use bookmark index to work with appropriate one. Copy method
will copy inside range of the bookmark and keep original bookmark in place, unchanged.