If you defined runtime parameters when you were building the query for your report, SQR Production Reporting Studio prompts you to enter values when you preview the report. You can either enter different values each time you run the report, or you can define default values to use in the report preview.
For example, if you defined runtime parameters to limit the data retrieved to customers in a specific state who have orders greater than a specific amount, you could define a state and amount each time you ran the report, or you could define default values for the state and amount.
You define runtime parameters by creating a Where clause. See Creating Where Clauses to Evaluate Values Prompted at Runtime for more information.