If you're okay with only showing _up to_ the first four tracking #'s and ""etc."" at the end, you can just use the 'Tracking Numbers' field in the S/O Invoice Wrk file (which I think also works if printing from Invoice History). Otherwise, for S/O Invoice Entry printing, create a subreport for the so_invoicetracking file, and enable the 'Format with multiple columns' setting on the subreport Details section. Then create a 2nd subreport, for the ar_invoicehistorytracking file, enable 'Format with multiple columns', and stack this subreport on top of the other subreport.