Northen trail Outfitters (NTO) wants to change the current master-detail relationship between Shipments and Opportunity...

 To make sure that the changes are in production, you need to add the components to an outbound change set and deploy it to production. A change set is a tool that allows you to send customizations from one Salesforce org to another. A change set can contain components such as objects, fields, profiles, permission sets, workflows, and more. You can use change sets to migrate changes from a sandbox org to a production org or between two sandbox orgs that are affiliated with the same production org. In this case, you need to add the master-detail field and all the affected profiles to an outbound change set in your sandbox org and then deploy it to your production org. References: https://help.salesforce.com/s/articleView?id=sf.changesets.htm &type=5 https://help.salesforce.com/s/articleView?id=sf.changesets_components_field.htm &type=5