Creating a summary field from a summary field
I have a summary field for invoices for the current year, but I need another field that summarizes that field through many years (cumulative charges throughout the life of the contract). How do you do this? I have Filemaker Pro and it will not let me select a summary field as another summary option. I'm pretty new to filemaker, so a website with specific details or steps would be best.
FY11 Cumulative Invoices Contract Cumulative Invoices