Good day to you, hatim1,
Let's set up UAE and KSA VAT in QuickBooks Online (QBO).
You'll want to use the QBO International version when setting up UAE and KSA taxes. Find your country through this link: https://quickbooks.intuit.com/choose-country/ and subscribe from there.
Once settled, you can then turn on the VAT tracking. Let me show you how:
To ensure that taxes are taken out when you create a transaction, make sure to select Inclusive of Tax or Exclusive of Tax.
Check out these articles to keep you updated and for additional information:
Keep me posted if you have follow-up questions. I'm always glad to help.