Xcelsius Dashboard on BEx Queries as Source

Hi,

I need to create a dashboard with BEx query as source.

1) Is there any document, E-learnings that can be helpful?

2) How to move teh data to Excel from this Query?

3) In Net weaver BW connection window and in definition tab, I can see Input and Output values while in Data preview tab I am able to see columns rows and characteristics. How these two windows are different.

I am new SAP BW, could you please help

Regards, Nanda Kishore