Hi,
Pre format your data in a table.
Use the table as the data source for a tablix report.
Eg
--4 Col table
Group1 Col1
Group1 Col2
Group1 Col3
Group1 Col4
Group1 Col5
Group1 Col6
Group2 Col1
Group2 Col2
Group1 Col1 Col2 Col3
Col4 Col5 Col6
Group2 Col1 Col2
Hide duplicates in the group and sub total for each group. Possibly even put the totals in your table.
Cheers
😎