Hi Kavya,
First,you load your master data from 0customer_attr And 0customer_sales_attr to 0Customer and 0Cust_sales respectively. After that use these objects and other infoobjects in DSO AS key. Use those compounding Info Object as key on which a record will uniquily identified.
Now load the DSO and create your query to show the client.
Hope this will help you.
Arvind