Need some help with counting in Crystal Reports

Hello,

I need some help how to Create a report in Crystal reports...

I have data which contains parts used on the job.
The data looks like this:

Date        Employee         Number           Part
1-1.           2.                      2.                      Wheel
1-1.           2.                      4.                      Bolts
1-1.           1.                      1.                      Steel ring
1-1.           2.                      5.                      Steel ring


2-1.           2.                       3.                      Wheel
2-1.           2.                       5.                      Steel ring


I want to Create a report which shows all the used parts and the maximum numbers used on a day. Like this:

Part.             Number
Wheel.           3
Steel ring.     6
Bolts.             4


I can count the parts used per day. But how do i get the max numbers per part after that?
There can be a lot of parts being used.