Hello Rebecca,
Yes, you can accomplish this in Adagio Invoices with items that are setup to be Subtotals. They should use a different Style code than the items that are set up to be Details.
In data entry, you would insert the Subtotal Item after the list of Details.
In your Invoice Specification, you would set the section height for the Style code for Detail Items to very small so that it does not print.
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Regards,
Softrak Tech Support