You are setting up sales tax on a sales order for your customer.
You need to define the setup so that it calculates as follows:
The taxable amount is divided into parts, each of which falls into a range that has a specific sales tax

rate.
The part of the amount that falls into a given range is taxed according to the tax rate for that range.

The sales tax is the sum of the tax amounts that are calculated for each range. For example:

- @30% from 0 to 100 USD
- @20% from 101 to 1000 USD
- @10% from 1001 USD and above