Follow these steps:
1. Ensure you have both spreadsheets open on Excel: our worksheet and your bookkeeping spreadsheet;
2. Then, click on "View" then "View Side-by-Side". You should now see both spreadsheets at the same time: one above, one below on the same page;
3. Now pick up by the tab and drop either our worksheet into your spreadsheet, or vice versa to finish.
Failing that, you do not need to merge our worksheet into yours. You can keep the two spreadsheets separate, and use a formula to move your VAT Return nine-box figures to our spreadsheet and just upload that.