How to reset Record number every time when group change in Crystal Report

Many Time this type of Problem ask by follower the simple Method is Given below:
1:select the running total field from the Field Explorer.
2:In the 'Field to summarize' select the field which you want to summarize.
3:In the 'Type Of Summary' select count
4:In 'Evalute' select for each record
5: select On Change of Group on 'Reset'