Indeed i didn't explain the whole thing ;
My bookmark is deleted and it returns its starting index. Then i build my tree recursively with all my items and write the new tree into Word Document.
My final document doesn't have any bookmark in it.
That's why i can't update or replace my bookmark.
I did try a lot (only can get bookmark starting index or paragraph index).
I am trying to move cursor to starting index in order to start writing to it but i hope there is simplier way...
BR,
Vincent