Excel 2007 : Data entry forms using macros and buttons

I am trying to enter data into a table which is split into two sides using data entry forms.
This works just fine manually, but when I try to automate it and use macros operated by a buttons (input part a) and (input part b) I only get the data entry form form for part a despite first selecting the cells for part b. I have tried a couple of ways of doing it, see code below

For part a

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For part b

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I have left column c blank to split the table

I have also tried using Column.Select which also didn't work. When I press button for part b it brings up the data entry form for part a.

Any ideas?

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Why have you split the table?

I fairly sure that the inbuilt DataForm does not work with two tables on one sheet