AFAIK, not possible. You could, however, delete the table's outside borders, then overlay it with a rounded rectangle, which you could make transparent and/or send 'behind text'.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]

Thanks @macropod, I did think of that, but once this is created I'll be importing it to Adobe Acrobat to make into an interactive form. In my limited experience of Acrobat it doesn’t always import layout from word 100% correctly, so I'm trying to keep the original as simple as possible.

I’ll try it anyway & see how it goes.

Thanks