well the first page looks like you would only be displaying the summary values of the group 1 field.
the second page is either the detail of the group1 or another summary of a grouping inside of group1.
if you want to display both in the same report, one is going to need to be a subreport. CR only reads the data once per report, so it won't go through and read the data again...but a subreport is a 'new' report and CR will the data again.
This is why subreports can degrade the performance of a report...but sometimes they are the only solution.
HTH