Core offers a lot of flexibility when it comes to what you can display on your invoices. This is helpful especially when you want to exclude proprietary descriptions. For example, when billing for project phases, you can summarize the work being performed on them rather than listing the details. You can set this up in Global Settings > Invoice Templates. For specific invoice requirements, you can reach out to our BQE Customization Services to create a custom invoice for a fee.
Check the Core Help for more details on invoices.