How to add a VAT field to my Quote file?

You can add a VAT field or any other special fields such as VAT, GST, or amount to your Quote using Print Templates.
Please follow the below steps:

1. Log into the CRM.
2. Go to the Main Menu.
3. Select Print Templates module.
4. Edit your Quote Print Template record.
5. Go to the body section.
6. Select VAT field from the Special Fields drop-down menu under the Properties tab.
7. Click Save.