In "Z Report" include product group sales report

Good Day
Thanks a lot for nice and easy POS software.
I would like to have plugin/module for Z Reporting.
As you know in Belgium Cigarette and calling cards are 0% TAX/VAT.
So, when we generate the Z report we do not get any information directly on the z report. please help us. we need to have the information included in the z reporting which is we can get from under the
MANAGEMENT--->REPORTING-->PRODUCT GROUP-->SHOW REPORT.
I add a file which is shows CATAGORY's total sale which is similar like PRODUCT GROUP.
PLEASE HELP US!!!

Best Regards From
Sha M Alfatekeen
email: fatekeen@gmail.com
CellPhoen: +32465591981