you data table should already have the appeal code and amount in it. Each row is an amount(I presume). You would have a grouping (somehow) on the appeal, so you just have to ask CR for COUNT() and SUM(). I don't have experience with CrossTabs for CR, but for a 'regular' report, you just create the aggregate by clicking the Summation button (the Sigma/funny looking E), tell it what field you want to count or sum, the method to do(sum/count/average) and what group to place it in.
HTH