Sales Crystal Report

Question

hello again. i was given a scenario that i should have a crystal report on weekly,monthly,daily,yearly sales. i have the sales order and all that my only problem is what codes to use on the report. on the form that i should use there is 2 date time picker one for start and one for end. 1 combo box for the weekly,monthly etc and 1 button for the ok. can you guys help me? thanks