You didn't make use of styles so I edited the doc you provided and saved it as a dotx template so I could store the table as a building block.

With this template you can add a new blank table by either choosing it from the Quick Parts gallery or typing exta or extable and pressing Enter or F3

Attached Files

Table macro.dotx (21.6 KB, 10 views)

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Andrew Lockton
Chrysalis Design, Melbourne Australia