You just put a field whose count you need in detail section. Then either use runningtotal factility or use a formula
Count ({Table.Value})
Please check below link.
http://www.crystalreportsbook.com/Forum/forum_posts.asp?TID=11297
Question
I want to display rows that contain count() field with group by clause, How can we set programmatically this on crystal report on run time in c#
Solution
You just put a field whose count you need in detail section. Then either use runningtotal factility or use a formula
Count ({Table.Value})
Please check below link.
http://www.crystalreportsbook.com/Forum/forum_posts.asp?TID=11297