How to renumber multiple drawing numbers in a file location containing multiple dgn files.

I would like to see if there is a way to renumber multiple dgn files in the title block region where we have the drawing number. There should be a way to change and renumber these in multiple dgn files in case we have to renumber a 300-400 page document for engineering. I am unsure on how to do so. I have an excel macro that already renumbers the "file name" for me in the folder location, but as far as renumbering the dwg number in each individual dgn file, I have no clue where to do so. Reference image attached below. I am using V8i series 10 version.

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