Here's an example of how to use an external text file to record incremental numbering.
"Sometimes, when working on a project, you may want to save your documents in sequential order (for example, "0001", "0002", "0003", and so on).
If you wanted to do this manually, you would need to sort through your working directory for the latest file number before you could assign the next number to a new file.
Using this fairly straightforward Word macro, you can make creating sequenced files as easy as pressing a button."
Using Sequential Document Serial Numbers
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