Crystal Reports Shared Variables

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     I don't think there are any straight forward approaches here. Theoretically you could create a very long shared stringvar that is made up of multiple fields and data rows and pass that as needed but you would want to make sure the proper data architecture exists to support moving the right data to the right places.
Crystal has the option to show all headers/footers on drilldown and then to also hide fields with the drilldowngrouplevel function or just a straight ondrilldown. So theoretically you might be able to say place the more sub reports into group headers and footers that only appear when you drill down.
It all comes down to linking or filtering these sub reports and how to handle "drill Down" on a sub report. It acts differently...
Sorry this is so vague but I hope it gives you food for thought.