We will be using workbench as a tool in this this article.  For example, you have two objects called ‘Reservation__c’ and ‘Address__c’. ‘Reservation__c’ object has lookup field called ‘Billing_Address__c’ that is lookup to ‘Address__c’.  ‘Address__c’ object has External Id field called ‘Location_Id__c’. Assume that we already have records populated in Address objects. For example Id… Continue reading