It's nice to see you again here in the Community forum, @EasyAcc1.

QuickBooks integrate with hundreds of third-party software developers.

When it comes to integrating transactions, it would be best to contact the third-party application provider since the transactions that sync into your QuickBooks Online account depends on the transactions shared from the third party app. They can guide and walk you through on how to handle invoices not to include  the VAT. 

Additionally, I want you to get the most out of QuickBooks for your business. You can check some articles that are designed to help you get acclimated with the software. They can be accessed at the following link: QuickBooks Tutorials.

If there’s anything else you need help with in managing your QuickBooks account, reach back out by commenting below. I'm here for you. Have a great day!