User wants to filter the AR Aging Report by a particular Accounts Receivable Account.
1. Navigate to Reports > Customer/Receivables > A/R Aging > Customize Summary / Customize Detail
2. Click Filters
3. In the Add Fields (left pane), expand the Unpaid Receivables folder > select Account (Line)
4. In the Value column, set Filter to Equal To > select the specific Accounts Receivable Account user need to filter the report with
Note: Using Unpaid Receivables > Account as filter will filter out some transaction types such as Journal, Payment, and Customer Refunds.