The ability to be able to filter by Custom Fields to more easily identify certain customer types, please also improve the filtering within the billing area in bulk invoices.

We need the ability to be able to only filter certain customer groups for invoices monthly, and being able to only filter by customer or contract type is not flexible enough.

Being able to tag a customer or add a custom contract type, allows us to more easily identify customers with special billing needs. It takes too long trying to go through the customer list and cross reference what 'type' of customer a business is.