A user needs to amend e contract end change prices to reflect new discounts for existing active subscriptions and How should the user achieve this?

The Admin at Universal Containers set up a Price Rule to override List Price with a discounted promotional price. The Price Action has a formula which is as follows: SBQQ_ListPrice_c * (1 - Promotional_Discount_c). The Admin is finding that every Calculate is clicked, the price is adjusted. For example, if List Price is $10.00 and promotional discount is 10%: 10.00 * (1 - 020) = 9.00. The next time calculate is clicked, the following calculation takes place: 9 * (1-0.10) = 8.10. If List Price must be overridden, how can this problem be fixed?

Universal Containers wants to show a custom text field with the API name Addition_Text_c on the Quote Document. This field already exists and is located on the Quote object.
What is the correct syntax to insert this into an HTML Template Content?

MDQ products are automatically removed from normal Line Item tables whenever an output document includes an MDQ specific table layout in another section

Composite Summary Variables are Summary Variables that are combined with an additional calculation?