Hello there, jude-ballard!
I'm here to share some information about entering vat return.
Any items included in the exceptions report will have been included in the overall figure for VAT due. You do not need to re-enter these since they don't show on the VAT 100 report.
We can pull up either the VAT detail report or VAT 100 report within QuickBooks Online. With that, yes, we can get the total VAT additional amount under the previous period. We don't need to set up a fake one, as long they are already added to the system.
If you have other questions about it, please let us know. We are willing to help you further. Take care!
