Kurio, encontrei um doc que mostra uma maneira fácil de fazer, mas minha versão é 8. Qual você usa ?  Vou tentar baixar o Crystal 9, pra ver se consigo.   Set up the report  The report must be grouped on the same fields used in the cross-tab. For  example, if the cross-tab needs to display the PercentOfDistinctCount of the  Customer ID field with a Country row and Region column, perform the  following steps:  1. The first group is based on the cross-tab’s ‘row’ field. On the Insert menu,  click Group. From the top drop-down box select Customer.Country. Click  OK.  2. The second group is based on the cross-tab’s ‘column’ field. On the Insert  menu, click Group. From the top drop-down box select Customer.Region.  Click OK.  3. Insert the field that requires the PercentOfDistinctCount summary to your  details section. On the View menu click Field Explorer. Expand  Database Fields then expand Customer. Add the Customer.Customer ID  field to the Details section.  4. Right-click the Customer.Customer ID field and click Insert > Summary.  From the Calculate this summary drop-down box click Distinct count.  From the Summary location drop-down box click Group #2:  Customer.Region. Select the Show as a percentage of check box and  click Group #1: DistinctCount of Customer ID.  Crystal Reports 9  10/4/2002 3:24 PM Copyright  2002 Crystal Decisions, Inc. All Rights Reserved. Page 4  Create a formula  The next step is to create a formula, which displays the  PercentOfDistinctCount.  1. Create a formula and name it Distinct_Count.  2. From the Report Fields box double-click the Summary field created in the  previous steps. The formula will appear as:  PercentOfDistinctCount ({Customer.Customer ID}, {Customer.Region}, {Customer.Country})  3. Click the Save button then click the Close button.  Create a Cross-tab  The final step is to create a cross-tab to use the formula created in the previous  steps as the summarized field.  1. On the Insert menu click Cross-Tab. The Cross-tab Expert dialog box  will appear.  2. From the Available Fields box move Customer.Country to the Rows box.  3. From the Available Fields box move Customer.Region to the Columns  box.  4. From the Available Fields box move the @Distinct_Count formula, created  in the previous steps, to the Summarized Fields box.  5. Click the @Distinct_Count formula in the Summarized Fields box then  click the Change Summary button. From the Calculate this summary  drop-down box click Maximum.  6. Click the OK button to close the Cross-Tab Expert dialog box then insert  the cross-tab in the Report Header section.  7. Suppress every other section in the report.  Now when the report is previewed, the PercentOfDistinctCount summary in  the cross-tab will appear with correct decimal accuracy.  PercentOfCount Summaries  To correctly display a PercentOfCount summary, summarize a formula field  that displays a value of 1 in the cross-tab instead of summarizing a database  field. When this formula is summed it will display the same total as a count of  the field would return. Unlike a PercentOfCount summary, a PercentOfSum  summary will display correct decimal precision.  Unlike the previous example, the report  does not need to be set up with the  same grouping as the cross-tab in order  to display the correct value.  Crystal Reports 9  10/4/2002 3:24 PM Copyright  2002 Crystal Decisions, Inc. All Rights Reserved. Page 5  Create a formula  The first step is to create a formula, which outputs a value of 1.  1. Create a formula and name it Count. Enter the following:  WhileReadingRecords;  1  2. Click the Save button then click the Close button.  Create a Cross-tab  The final step is to create a cross-tab that uses the formula created in the  previous steps as the summarized field.  1. On the Insert menu click Cross-Tab. The Cross-tab Expert will appear.  2. From the Available Fields box move Customer.Country to the Rows box.  3. From the Available Fields box move Customer.Region to the Columns  box.  4. Add the @Count formula created in the previous steps to the Summarized  fields box.  5. Click the @Count formula in the Summarized Fields box then click the  Change Summary button. The Edit Summary dialog box will appear.  6. From the Calculate this summary drop-down box click Sum.  7. Check the Show as a percentage of check box and, from the drop-down  box click Total: Sum of Customer ID.  8. Select the Column radio button.  9. Click the OK button to close the Edit Summary dialog box then click the  OK button to close the Cross-Tab Expert dialog box.  10. Insert the cross-tab in the Report Header section.  Now, when the report is previewed the PercentOfCount summary in the crosstab  will appear with correct decimal accuracy.