Hmm.  I'm going to present a few possible scenarios, as I'm not sure I'm understanding exactly what you want.

If you want to actually create a new table in the database (i.e., a new place to store the data), then Crystal is not the tool you want to use.  Technically, it can be done.  Brian has an example of how to do it in his book.  But, I highly recommend that you look for a solution within the database first.

If you are simply looking to produce a separate report for each day, then it somewhat depends on what your data looks like. 

Does each record have a date or datetime field associated with it?  If so, it is a simple matter of grouping based on that field.  In the Group Expert, click on the group, and click on Options.  At the bottom of the screen, there is a drop-down box.  Select "for each day," and that should give you what you need.

If that does not give you what you need, then things get a bit trickier.  Try posting a bit of sample data, and an idea of the final format you want, and we'll try to make it happen.