I want to get the Lifetime Value of a Customer who has purchased Brand X. Each sale is an opportunity. Currently I have a report that gives me the total value of this customers purchases of Brand X but how do I include the other brands also. I do not want to include customers who have not purchased Brand X
If you are using Accounts, Opportunities, and Products, you can create a rollup summary field on the Account that SUMs Opportunities. You might need to create rollup summary fields on Opportunity to COUNT or SUM OppLineItems for a specific Product.