I appreciate you for providing detailed information and screenshot regarding your concern. Let's work together to resolve this.
Based on the screenshot, the issue is in the Amount are that is set to Inclusive of Tax. Once you select the Inclusive of Tax option, the price of your items or services already includes sales tax.
To apply the pre-tax subtotal, you need to change it into Exclusive of Tax. This way the price of your items or services doesn't include sales tax which is shown in the sub total amount.
Feel free to share any further questions in the comments below.
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