Conditionally end a report

I am new to CR so this might be a really stupid question. CR version 10.

I want to end the report after X number of records based on a parameter field. Specifically I want to list customers in order of total sales but specify how many customers to print out. Like, Top 100 Customers by Sales.

I know I could print all records to the screen then choose to only print X number of pages but that's not possible if the report goes right to the printer.

Thank you.Type TOP into Crystal's online help (index) and see what you get.l