Help Active Report

Hello everybody!

Active Report’m studying and I’m two situations that I could not solve.

1 - Create a report in AR and put two fields a description of the product, with sales value and summary this value. I include a compoment Date Drop Down List and I filtered this product category. So far it worked, when I select product in DDDL updates the query on the screen. But summary field not updated. How do I solve this?

2 - In the report it is possible to create a parameter without being obligatory. How to do this in ACTIVE REPORT?

Excellent weekend.