You MUST create the parameters in the Command Editor - it will not "see" the parameters that have been created in the report. You will then add them to the query using the Crystal {?Parameter} syntax. If the parameter is a string, you need to enclose it in single quotes.
The Command Editor only allows you to set a very limited number of properties. However, you can edit the properties in the report after it's been created in the Command Editor to do thing like make it dynamic. NOTE: Parameters used in a command MUST have a value - they cannot be null.
-Dell