To automate applying discounts on opportunity products when an opportunity is won, the administrator should use Flow Builder, which is a tool that allows creating complex business processes with clicks. The administrator can create an autolaunched flow that runs when an opportunity is updated, checks if its stage is "Closed Won", and updates its related opportunity products with discounts from a formula or variable. Approval Process, Prebuilt Macro, and Formula Field are not able to update related records based on criteria. Reference: https://help.salesforce.com/s/articleView?id=sf.flow_build_overview.htm&type=5

To access the account object in Salesforce, users need to have permission to the account object on their profile or permission set. Permission to an object determines what users can do with records of that object, such as create, read, edit, delete, view all, or modify all. If users do not have permission to an object, they will not be able to see or access that object in Salesforce. Reference: https://help.salesforce.com/s/articleView?id=sf.users_profiles_permissions.htm&type=5