i doubt that it will be easy, I don't know if this will work, but this is what I would try:
make your working report (or a copy), a subreport of the new report.
create a group in the new main report that matches gh4 in the subreport
make shared variables in the subreport that will return the values that are your 'new' details
modify the subreport to only display the GF4 section (conditionally suppress based on a parameter--or modify a copy of the report)
use the shared variables from the subreport to drive the summaries and other 'new' features in the main report.
It's something to try, as I don't think that there is a direct way...
unless you just want to suppress the rest of the existing report and build the additional functionality into the existing report. I don't know about running totals, which probably will work, but they are DBlank's forte, I would use shared variables to keep track of any new values that I wanted to add onto the report to make it 'work'
HTH
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