How do I specify the "Related To" field for an invoice?

In Brexa, the "Related To" field allows you to associate an invoice with a specific project, service, or customer. When creating or editing an invoice, simply select the relevant entity from a dropdown list or search for the associated item. This feature is especially useful for businesses that handle multiple projects or customers simultaneously, as it helps organize invoices for easier tracking and reporting. You can filter invoices by this field later to gain insights into specific projects or clients.