Frankly this is a horribly formatted document, with paragraph breaks instead of line wrapping, multiple tabs and, as you concede, manual numbering schemes. It works as it is, but there is no easy way to deal with changing the formatting to use autonumbering. It would take longer to figure out a macro to cope with all the anomalies than it would to reformat manually, using the existing Heading styles to set the levels, which you can then format to give the appearance you need.

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Graham Mayor - MS MVP (Word) (2002-2019)
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