• Logic is in ETM_Batch_UpdateTerritoryValues.cls
• Sorry about the map at the top, that should have moved to metadata as I did in challenge #6

NOTE: this is untested outside of my production environment

• Main logic is in ETM_PriceAgreementsService.cls
• Called by triggers on PriceAgreement_Account__c, Territory2, and UserTerritory2Association
• The prior batch class ETM_Batch_UpdateTerritoryValues.cls calls as well
• The service may batch updates with ETM_Batch_AgreementShares.cls

• Both solutions are implemented in ETM_Account.trigger

• Start with the batch class ETM_Batch_CopyShadowFields.cls
• Support logic in ETM_AccountsService.cls
• Field mapping in custom metadata row Account_Visible_To_Shadow
• lightning component can be accessed at /c/ETM_App.app

See queries here