What version of Crystal do you use?
If you are using version 8, you are able to use thoses.
When you create your report, in the database source, you select your datasource.
For exemple, if you select OLEDB, the datalink window will come up and you then connect yourself to the server.
You should then see a list of your table and stored proc.
If not, you may have to change the option in the Data explorer window and select "stored procedure" in the show section.

Hope this will help!