A sales agreement is a long-term contract that defines the terms and conditions for the products and services that you sell to your customers. You can perform various actions on a sales agreement to manage its lifecycle, such as approving, activating, expiring, or deleting it. Two of the out-of-the-box actions that you can perform on a sales agreement are:
* Recalculate Actuals: This action updates the actuals for the sales agreement based on the invoices and orders associated with it. You can recalculate actuals manually or schedule it to run automatically at a specified frequency. Recalculating actuals helps you track the progress and performance of the sales agreement over time.
* Update Products: This action allows you to add, remove, or modify the products and categories in the sales agreement. You can update products manually or use the mass update feature to apply changes to multiple products at once. Updating products helps you adjust the sales agreement to reflect the changing needs and preferences of your customers.
References: Sales Agreements and Forecasting in Manufacturing Cloud, Sales Agreement, Get Started with Manufacturing Cloud for Sales, Create and Work with Sales Agreements, Manufacturing Cloud

Before you create the analytics for manufacturing App, you need to ensure that your data meets some specific requirements. One of these requirements is that at least one record must exist in each of the Manufacturing cloud objects to be analyzed, such as sales agreements, account forecasts, account manager targets, and rebates. Otherwise, the data fails the CRM Analytics check and you see an error message. Having records in these objects ensures that the app can import and display relevant data for your business1. References: Data Required to Create the Analytics for Manufacturing App

Experience Builder is the tool that can be used to customize the site after selecting the manufacturing template in the community creation wizard. Experience Builder is a point-and-click tool that lets you create pixel-perfect, responsive, and dynamic digital experiences for your customers, partners, and employees. You can use Experience Builder to customize the layout, branding, navigation, components, pages, and permissions of your site. You can also preview and publish your changes, and monitor the performance and usage of your site. Reference: Create the Manufacturing Partner Template and Add Partner Users - Salesforce, Create an LWR Site in Experience Cloud - Salesforce Developers, Experience Builder - Salesforce Help

Explanation
Program Based Business is a feature of Manufacturing Cloud that allows manufacturers to track and manage the demand from their end customers (such as phone brands) and compare it with the actual orders from their channel partners (such as distributors or contract manufacturers). This feature helps manufacturers to plan for future opportunities, optimize their inventory and production, and increase their market share. Program Based Business enables manufacturers to:
Create programs that represent the end customer demand for a specific product or product family over a period of time.
Associate sales agreements and orders with programs to track the actual performance against the program demand.
Use program analytics to monitor the program health, identify gaps and risks, and take corrective actions.
Use program forecasts to generate account forecasts based on the program demand and actuals. References: Program Based Business Overview, Create a Program, Associate Sales Agreements and Orders with Programs, Use Program Analytics, Use Program Forecasts.

Sales Agreements are a core functionality of Manufacturing Cloud for Sales, which allows manufacturers to manage their long-term negotiated business with customers and distributors. Sales Agreements capture the pricing, volumes, and order realization data of run-rate business, and enable accurate forecasting and demand planning1.
Account Based Forecasts are another key functionality of Manufacturing Cloud for Sales, which allows manufacturers to align sales and operations teams with a common view of the market demand. Account Based Forecasts enable strategic planning and precise input into the sales and operations planning process with operational forecast flexibility by any dimension1. References:
1: The CRM Analytics for Manufacturing Template - Salesforce