Peter,
Unfortunately, PrintShop Mail doesn't have the ability to print all records on layout 1, then all records on layout 2, etc... Using the "number of copies" will not move the records forward, so this isn't an option.
Your best bet is probably to duplicate records in your data file. Copy the 520 records six times. Then, use layout conditions based on the RECORD_NR() function, that returns the current record's number. So you could use a condition on layout 1:
IF(RECORD_NR() <= 520, Print, Skip)
Then on layout 2:
IF(RECORD_NR() >= 521 AND RECORD_NR() <= 1040, Print, Skip)
And so on for the rest of the layouts. In the end, this will produce the output you want, in one single pdf, instead of multiple pdf.
Regards,
Raphaël Lalonde Lefebvre