I'm trying to produce a printout of an invoice. The makeup of the data is a single record for the invoice header (i.e. customer information and subtotal, taxes, shipping, and total) and 1 to many records in the invoice detail.

On the entry screen I am using a portal with no limit to the number of rows which can be printed.

Based on print sizes that have been selected, if there are less than 20 item lines on the invoice, I can print it all on one page. However if there are more than 20 item lines I need to break to multiple pages. If that is the case, I want to leave the subtotal, taxes, shipping, and total fields empty on the first page, and have them printed on the second page.

How can I make the printed version display the appropriate number of lines, and do a page break after every 20 item lines BUT make sure that the subtotal, taxes, shipping charges, and total ONLY appear on the last page.

Is there any way to accomplish what I am attempting to do?

Your print layout should be based on the line items table, and the subtotal, taxes, shipping and total fields could be in a trailing subsummary part.