Before the days of computers, the printed invoice form would have the
summary at the bottom of the page, because there was no way to know how many
items would be needed at the time the page was printed. This is no longer
the case. In fact, a good argument could be made that placing the summary
immediately after the last item helps prevent the fraudlent addition of
items being typed onto the printed invoice that are not included in the
total at the bottom. Trying to make the computerized invoice fit the
old-school look is counter-productive (i.e. wasted effort that decreases
reliability.)

If you want to do it anyway, it sounds like you have simulated it with
unbound controls in the page footer. This works, but has the side-effect of
making that space unusable on previous pages of the invoice. Another
approach is to identify the last item in the invoice, and in the Format
event of the Detail section, continue to print the space for that item until
you are far enough down the page to print the report/group footer. You can
do that by toggling the report's runtime properties (PrintSection,
MoveLayout, NextRecord) until the report's Top property is far enough down
the page. (Top is in twips, where 1440 twips = 1 inch.) This is still quite
messy if the section CanGrow.

To get vertical lines on the page, use the Line method in the Page event of
the report.