Implement B2B Commerce and use the CPQ B2B Commerce Connector to integrate to CPQ1. This is a fast and easy way of enabling self-service ordering for customers with existing special pricing from CPQ.
Keep CPQ as the Product and Pricing master1. This is a recommended practice toavoid data duplication and inconsistency between CPQ and B2B Commerce.
For Mask Makers LLC, implementing Salesforce B2B Commerce with integration to the existing CPQ system via the CPQ B2B Commerce Connector is the optimal approach. Keeping CPQ as the Product and Pricing master ensures that the complex pricing rules and special pricing agreements already established in CPQ are maintained and leveraged within the B2B Commerce environment. This setup allows customers to benefit from a streamlined and personalized self-service experience while ensuring pricing consistency and accuracy. The CPQ B2B Commerce Connector facilitates the seamless flow of product and pricing information from CPQ to B2B Commerce, enabling Mask Makers LLC to provide a simplified and efficient ordering process for its customers, adhering to Salesforce best practices for integrating CPQ and B2B Commerce.

B2B Commerce is a solution that allows you to create ecommerce websites for your business customers1.
Salesforce Field Service is a solution that allows you to manage your field service operations, such as scheduling appointments, dispatching technicians, and tracking assets2.
Experience Cloud is a solution that allows you to create digital experiences for your customers, partners, and employees using templates and components2.
MuleSoft is a solution that allows you to integrate data from different systems using APIs34.
To fulfill Universal Containers' requirement for a customer portal to order spare parts and schedule service appointments, the combination of B2B Commerce, Salesforce Field Service, and Experience Cloud, integrated with MuleSoft, offers a comprehensive solution. B2B Commerce enables a self-service ordering platform for spare parts, while Salesforce Field Service facilitates the scheduling and management of service appointments. Experience Cloud provides the framework for building a customer-facing portal that integrates these functionalities. MuleSoft serves as the integration layer to connect these Salesforce solutions with UC's ERP system, ensuring seamless data flow and order fulfillment processes. This architecture supports scalability for future integrations, aligning with Salesforce's best practices for building connected and customer-centric solutions.

This way, you can preserve the historical data of your sales transactions related to the deactivated products without deleting them from Salesforce. You can also avoid syncing issues between your ERP and Salesforce by keeping the product status consistent1.
Deactivating a product in Salesforce means that it cannot be added to new opportunities or quotes, but it remains visible on existing ones1. You can also deactivate all related prices for that product at the same time by enabling a setting in Product Settings1. To mark an opportunity or quote as inactive, you can use a custom field or a workflow rule that changes its status based on certain criteria3.
https://help.salesforce.com/s/articleView?id=customize_product.htm&language=en_US&type=0

Salesforce Sales Cloud is the system of record for the sales process because it contains information about opportunities and opportunity products, which are used for forecasting and reporting. It also integrates with other clouds such as B2B Commerce and CPQ to support the cart-to-quote process.
https://help.salesforce.com/s/articleView?id=icx_b2c_crosscloudengagement_systems_of_record.htm&language=en_US&type=5