I'm in Cyprus.My sales is subject to a 0%VAT rate.I purchase materials at VAT rates of 19%.I can't select VAT from the supplier invoice in the prog.How do I set up VAT?

Hello there, n-tikhonov.

You'll have to create tax on the Tax page before you can choose VAT rates in the supplier invoice. Let me walk you through the entire process:

Step 1: Create tax

1. Go to the Taxes menu and select Set up tax.
   
2. Enter all the necessary details. You can tick the This tax is collected on purchases box to add purchase rate.
3. Once done, click Next.
   
4. When you're ready  to track tax, hit OK.
   

Step 2: Create a bill and apply the tax you created

1. Go to the QuickBooks Home page and select the + New button.
2. Choose Bill.
3. You'll find a Tax column where you can input the VAT you created.
   
4. After entering all the necessary details, click Save.

You can check this article to learn more about VAT rates: How do I set up sales GST/VAT rates and use them on forms? (International QBO). 

If you have further questions about configuring the VAT rate in the system, feel free to let me know by commenting below. I'm here to assist you.