BIG thanks to you, Dimitar!
I will consider grouping according to what result I will get from exported grid to Excel file.
About aggregates, is it possible to bind from xml in aggregate cells that <together> values? Auto sums etc. might be risky for this project.
For 2nd example I have realised replied sollution erlier, but result is just for transactions or <together> not for both.
My earlier idea for 2nd example failed – make 1 data adapter who binds to grid transactions and then another data adapter who bind in <together> records, but seems like jqxGrid don’t support that or there is some after bind statement who binds again at same grid. Any ideas?