Compare two datasets in crosstab by showing percentage of sales

Question

I am wanting to compare two datasets in a crosstab chart.
Basically I have a sales table and a business costs table. 
My business costs table fields look like this:
Category
CostDate
CategoryCost
My sales tabel looks like this:
PartNumber
SalesDate
SalesAmount
In my crosstab I want to group my rows by Category and my columns by Month.
So that in my summaries I can show sum of category cost and the percent of sales for that particular month.  I can do everything except show percent of sales for that specific month. My sales table has a SalesDate that I will be using to group off of.
Any ideas on how to do this, I am not sure where to even start. I am still new with crystal reports.
my sales data
PartNumber     SalesDate     SalesAmount
Part1     1/1/2011      $1.00
Part2     1/1/2011      $1.00
Part3     1/1/2011      $1.00
Part4     1/1/2011      $1.00
Part5     1/1/2011      $1.00
Part6     1/1/2011      $1.00
Part7     2/1/2011      $1.00
Part8     2/1/2011      $1.00
Part9     2/1/2011      $1.00
Part10     2/1/2011      $1.00
Part11     2/1/2011      $1.00
Part12     2/1/2011      $1.00
Part13     2/1/2011      $1.00
My business cost data
Category     CostDate     CategoryCost
Office     1/1/2011      $1.00
Office     2/1/2011      $1.00
Warehouse     1/1/2011      $1.00
Warehouse     1/15/2011      $1.00
Warehouse     2/1/2011      $1.00
Quality     1/1/2011      $1.00
Quality     2/1/2011      $1.00
Quality     2/15/2011      $1.00
What I want my crosstab to look like
                  Total       |                     1/2011  |                   2/2011     
     Business cost  |  % of Sales  |  Business cost  |  % of Sales |  Business cost  |  % of Sales
Total  |  $8.00  |  62%  |  $4.00  |  67%  |  $4.00  |  57%
Office  |        $2.00  |  15%  |  $1.00  |  17%  |  $1.00  |  14%
Quality  |        $3.00  |  23%  |  $1.00  |  17%  |  $2.00  |  29%
Warehouse  |  $3.00  |  23%  |  $2.00  |  33%  |  $1.00  |  14%

Answer 1

Hi Joshua,
assuming that you have linked your two tables and built a crosstab report:
In the summary data field you summarize 2 fields
1. your SUm of Business Cost
2. your Sum of sales.  -> Edit that summary to show % of the Table field you want to summarize and select by column