Question
“Once my columns have finished printing on a page, how can I fill the remaining space to the bottom of the page?”
Solution
Use a group footer band to fill the space. Inside the GroopFooterBand.BeforePrint event, check the remaining space on the page and resize the band to match that size.
Download: FillSpaceAfterLastColumn.zip
Sample Delphi code:
uses
  ppTypes, 
  ppUtils;
procedure TForm1.ppGroupFooterBand1BeforePrint(Sender: TObject);
begin
  ResizeGroupFooter;
end; 
procedure TForm1.ResizeGroupFooter;
var
  liMMHeight: Longint;
begin
  //Get the remaining space in mmthousandths (microns).
  liMMHeight := ppReport1.PrinterSetup.PageDef.mmHeight - ppDetailBand1.SpaceUsed - ppReport1.PrinterSetup.PageDef.mmMarginBottom;
  //Resize the group footer band.
  ppGroupFooterBand1.Height := ppFromMMThousandths(liMMHeight, utInches, pprtVertical, nil);
  //Resize objects inside the group footer.
  ppShape1.Height := ppFromMMThousandths(liMMHeight, utInches, pprtVertical, nil);
end;