Automatic calculation of TAX (VAT) when creating quotes

A sales tax (eg VAT) is in all countries and for all products a percentage of the price of goods or services one sells. A percentage field is needed here since it is more accurate/reliable and having sales staff calculate the amounts (€/$£¥) costs unnecessary amounts of time.
Another thing is the discount option at the end of the quote.
Please offer both options, i.e. amount and as a second option a percentage. Same as it’s offered on line item level.
Also, such a discount should be before the tax calculation takes place.
Price, net
-discount, net (amount/%)
———————-
Total excl. VAT/any applicable taxes
Tax (e.g. VAT 19%)
———————-
Total incl. VAT/taxes
In B2B sales, everybody communicates in net amounts thus granting a discount is net, too. I wouldn’t want to have my sellers calculate the amount incl. tax to match the agreed net discount value.
Please implement this asap.