Group By - Client
Sum - Past:IIF(DateDiff("d",[InvoiceDate],Date())>30,[InvoiceNetTotal],0)
Sum - Current:IIF(DateDiff("d",[InvoiceDate],Date())<31,[InvoiceNetTotal],0)

Works for positive numbers, but if InvoiceNetTotal = ($4.00) and
InvoiceNetTotal = ($2.00) it should give me ($6.00) providing both
Invoice Dates are > 30 or <31. I checked the Invoice Dates and these
amounts should be showing.