Ashish I can give you 100 questions on each and I assure you that you will fail to answer any new technical query that arises in production or atleast at development.

This approach is not advisible.

Spend some time understanding the underlying architecture of BI-DW

Anyways, since you have taken time to post:

Please try to answer the following:

Can you enhance an existing aggregation design (custom or produced with the

Aggregation Design Wizard) with an aggregation design from the usage-Based

optimization Wizard?