In BQE CORE, you can customize the invoice file name to include specific details such as the invoice number and project name when sending invoices via email. To set this up, navigate to User Settings > Company > Email Settings. At the bottom of the screen, you will find the Invoice File Name field, where you can define a custom format using dynamic fields like invoice number, project name, etc. All invoices sent as email attachments will then reflect the customized file name, making them easier to identify and manage.