Using a Roll-up Summary field from the Opportunity to the Account is the best way to meet the requirement of showing the total values of open opportunities on account records when enabling Advanced Currency Management. A Roll-up Summary field is a field that calculates values from related records, such as count, sum, min, max, etc. Advanced Currency Management is a feature that allows users to enable dated exchange rates and track historical exchange rates in Salesforce. By using a Roll-up Summary field from the Opportunity to the Account, Cloud Kicks can display the sum of the open opportunity amounts on each account record, and use the dated exchange rates to convert the currency amounts based on the close date of the opportunities.