I can't find fields in configuration section.Any idea why is that?

In Odoo, it is possible to display an amount of VAT under the untaxed amount in Sales > Quotations without adding that VAT amount to the total at the end. This can be achieved by creating a new field in the quotation form view that displays the VAT amount, and then linking that field to the appropriate computation. Here are the general steps you can follow:

1. Create a new field in the quotation form view: Go to the Sales app and click on "Configuration" and then "Fields". Create a new field for the VAT amount and link it to the quotation model.

2. Add the new field to the form view: Go to the Sales app and click on "Configuration" and then "Views". Locate the form view for quotations and add the new field to the view.

3. Compute the VAT amount: You can compute the VAT amount by using the formula [(Untaxed Amount * VAT rate) / 100].

4. Modify the view to display the VAT amount without adding it to the total: In the form view, you can modify the code that displays the total amount to exclude the VAT amount.

5. Save the changes and test the result by creating a new quotation and check if the VAT amount is displayed correctly.

Please note that the above steps are general, and the process may vary depending on the version of Odoo you are using and your specific setup. You may need to consult the documentation for further information on how to customize views and fields in Odoo.