Invoice Screen Customization

Is there an easy way to add a field on the AR Invoice Entry and Tracker screen that provided the unit cost of each line item on the invoice? I know how to add a field, but where do I add the formula to compute cost? The sum of the labor, material and burden costs. Also once the field is created, would I be automatically able to pull the new field value from the invcdtl table to create a calculated field in baq?

You could just add an unbound text field and then use EpiViewNotification to populate it (probably with NotifyType.Initialize). You don’t need that in the BAQ - you can easily create a calculated field for it.