Explanation
Service Territory Location is a junction object that links Service Territory and Location objects[236]. Related Lists are components on page layouts that show records that are related to a record through a lookup or master-detail relationship[237]. Adding the Service Territory Location Related List on the Service Territory page layout and adding the Service Territory Location Related List on the Location page layout would allow Universal Containers to show how Locations are associated to Territories by displaying a list of Service Territory Locations on each record[238]. Creating the Service Territory Location as a Service Territory lookup field or creating the Service Territory Location as a Location lookup field would not work because they are not valid fields on either object. References:
https://developer.salesforce.com/docs/atlas.en-us.api.meta/api/sforce_api_objects_serviceterritorylocation.htm
https://help.salesforce.com/s/articleView?id=sf.customize_related_lists.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.fs_service_territory_locations_overview.htm&type=5

Explanation
This option allows tracking the required work for each machine separately, and scheduling a service appointment for each work order line item. References:
https://help.salesforce.com/s/articleView?id=sf.fs_work_order_line_items.htm&type=5

Explanation
Work Types are templates that define the duration, skills, and products required for a work order or work order line item. By creating Work Types and Skill Requirements for Install, Break-fix, and Inspections, Universal Containers can standardize creation of Work Orders with the correct skills and estimated time to completion.
Work Order Record Types for Break-fix, Install, and Inspection would allow creating different page layouts and picklist values for different types of work orders, but not define skills and duration. Work Type Line Items for Install, Break-fix, and Inspections would allow creating templates for work order line items, but not work orders. Work Order custom fields to define Install, Break-fix, and Inspections would allow capturing additional information for different types of work orders, but not define skills and duration. References:
https://help.salesforce.com/s/articleView?id=sf.fs_work_types.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.fs_work_orders.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.fs_work_order_line_items.htm&type=5

Explanation
A custom lightning component that displays work order progress can be created using Lightning Web Components or Aura Components and deployed to technicians through the Field Service Mobile App using Mobile App Extensions. Adding the work order line items related list to the work order page layout would not show the work progress on the work order line-item card in the Field Service Mobile App. Creating a custom visual force page or a report chart would not be compatible with the Field Service Mobile App user interface.
References: https://developer.salesforce.com/docs/component-library/documentation/en/lwc
https://developer.salesforce.com/docs/atlas.en-us.lightning.meta/lightning/
https://help.salesforce.com/s/articleView?id=sf.fs_mobile_app_extensions.htm&type=5

Explanation
A Product Request record can be added to a Work Order to request a product from inventory for a service appointment. A Work Type is a template that defines the duration, skills, and products required for a work order or work order line item. A Service Appointment is a record that represents a scheduled visit by a service resource to a customer location. A Service Report is a document that summarizes the details and outcomes of a service appointment. References:
https://help.salesforce.com/s/articleView?id=sf.fs_product_requests.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.fs_work_types.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.fs_service_appointments.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.fs_service_reports.htm&type=5