What is most important thing cooperate sales ?

First, it is corporate (not cooperate) sales.

Personally, I think 3 elements are the most important in corporate sales: 

 

1) Know your product very VERY well.

2) Learn all about your client before even approaching them.

3) Building and nurturing the database of clients and prospects.

information regarding particular product is most important.

attitude, if attitude is positive we may work smoothly, every task and business depend upon attitude of employee