Explanation
if Sales Agreement List View is not selected in the Account Forecast Calculation Settings, no sales agreements will be considered when calculating the sales agreement metric values of account forecasts. This means that the account forecasts will only reflect the opportunity metric values, and not the sales agreement metric values. To include the sales agreement metric values in the account forecasts, you need to select a sales agreement list view that defines which sales agreements to use for the calculations. References: 1: Configure Account Forecast Calculation Settings - Salesforce

A System Integration Testing (SIT) environment is used as an environment to perform system-to-system testing. This means that the SIT environment is used to test the integration of different systems or components that are part of the Salesforce Manufacturing Cloud solution. The SIT environment allows the verification of the functionality, performance, and reliability of the integrated systems, as well as the identification and resolution of any defects or issues that may arise during the integration process. The SIT environment is typically a replica of the production environment, but with a smaller data set and lower security requirements.
The SIT environment is also used to validate the data migration and synchronization between the source and target systems, as well as the compatibility and interoperability of the APIs and web services that are used for the integration. References:
* Manufacturing Cloud - Salesforce
* How to Perform Automated Integration Testing in Salesforce
* Automate and Test During Integration

Explanation
Sales agreement cloning is a feature that allows users to create a new sales agreement by copying the details from an existing one. This can save time and effort when creating similar sales agreements for different accounts or time periods. When cloning a sales agreement, the product details, such as product name, quantity, price, and discount, are copied over from the original sales agreement. The new sales agreement is created in draft status, which means it can be edited and submitted for approval. The default start date of the new sales agreement is the current date, not the start date of the original sales agreement. The agreement term details, such as metrics, actuals, and forecasts, are not copied over from the original sales agreement, as they are specific to each sales agreement and time period. References: Clone a Sales Agreement, Sales Agreement Cloning

: According to the Salesforce Manufacturing Cloud documentation, to apply a rebate program to more than one account, you need to add each account to the members related list on the rebate program. This way, you can enroll multiple accounts as members of the same rebate program and track their transactions and payouts. You can add one account at a time, or use an existing Accounts list view to enroll multiple members. You can also enroll an account in multiple rebate programs if needed1. Reference: 1: Enroll Members to a Rebate Program