Upon adding a lookup field to Account from a custom object, Box:

D. Accounts with Boxes. Salesforce automatically creates a new report type that reflects the relationship from the perspective of the parent object, in this case, Accounts, showing related Box records.

This new report type enables users to create reports that list Accounts along with their associated Boxes, if any.

For further understanding of report types and relationships, Salesforce's guide on Report Types provides comprehensive information on how these are structured following modifications to object relationships.

To start tracking how many shoe subscriptions have been sold for each shoe catalog, a roll-up summary field should be created. A roll-up summary field calculates values from related records on a master-detail relationship. It can count, sum, min, or max numeric values from child records on a parent record. 

Schema Builder is a tool that presents a comprehensive view of all relationships in one place. It allows app builders to see how objects are connected and create new relationships. Lightning Object Creator, Object Manager, and Lightning Record Page are not tools for viewing relationships, but for creating objects, managing fields, and customizing record pages respectively.

The app builder should know that a field type change is included in the change set and that it can cause a delay in the deployment. A field type change is a change that modifies the data type of an existing field, such as changing a text field to a number field. A field type change can affect many aspects of Salesforce functionality, such as validation rules, formulas, workflows, reports, dashboards, and more. Therefore, deploying a change set that contains a field type change can take longer than usual and require more testing and verification. Option A, C, and D are not changes that can cause a delay in the deployment.

Putting the SC in the role hierarchy above the technicians whose work orders they review will provide the required access, given a private data model. The role hierarchy determines how users can access records they do not own. Users at any given role level can view, edit, and report on all data owned by or shared with users below them in the role hierarchy.

Create a validation rule that uses the PRIORVALUE function is how an app builder can meet the requirement of preventing users from increasing the value of Estimated Hours after it is set. According to the Salesforce documentation, “PRIORVALUE returns the previous value of a field.” The validation rule can compare the current value and the prior value of Estimated Hours and display an error message if the current value is greater than the prior value. Creating a formula default value for the custom field, creating a formula field that uses the PREVGROUPVAL function, and creating a validation rule that uses the ISCHANGED function are not valid or correct solutions for this requirement.