Making the field Read Only on the page layout prevents users from manually entering or editing the field value on the record page. This ensures that users cannot bypass answering the questions in order to determine their Tier value. Using a screen flow to ask the questions allows administrators to create an interactive user interface that guides users through a series of screens based on their inputs and logic. A screen flow can be used to ask questions and set the field value based on the answers

A custom summary formula is a formula that calculates values from summary fields in reports such as sum, average, min, max, etc. Custom summary formulas can use functions such as PREVGROUPVAL to compare values from different groups in reports. For example, to calculate the year-over-year change in dollar amount of opportunities, an administrator can create a custom summary formula that uses PREVGROUPVAL to compare the sum of amount from this year's group with the sum of amount from last year's group, and divide it by last year's sum of amount. Reference: https://help.salesforce.com/s/articleView?id=sf.reports_builder_fields_summary_formulas.htm&type=5 https://help.salesforce.com/s/articleView?id=sf.reports_formulas_prevgroupval.htm&type=5

Entitlement templates are a way to automatically create and associate entitlements with products or service contracts. They can help simplify the management of entitlements and ensure that customers receive the correct level of service. Entitlement templates can also be used to define service levels, milestones, and entitlement processes for different types of products or service contracts.

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. Reference: 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

An authentication app is a mobile app that generates verification codes for logging in to Salesforce or other services that require multi-factor authentication (MFA). A username and password are also required for logging in to Salesforce, but they are not sufficient for MFA. Reference: https://help.salesforce.com/s/articleView?id=sf.identity_auth_apps.htm&type=5