Hi @W_Vann_Hall First of all, thank you for sharing your formula to the community. I’m fairly new to Airtable, but I have seen all your examples of an Excel formula that references on the daily change of amount. However, may I request for you to crea...

@Julian_Kirkness I have a "Customer/Invoice /Product Line/Products database. When I deleted the Invoice, the associated Line Items were not deleted. So I tried your suggestion, and it worked like a charm! Thanks man, I really appreciate your sharing ...