For this you can create nested groups. The shoe style would be group #1 and the shoe size would be Group #2. You can also add subtotals on the numeric fields displayed in the Details section to get the number of each size.
I also see that you have registered for the online ebooks. You can click this link to read more:
http://members.crystalreportsbook.com/books/?p=35 There is a tutorial that walks you through this at
http://members.crystalreportsbook.com/books/?p=36
Edited by BrianBischof - 25 Mar 2008 at 6:19pm