SALES PROCESS IS DIVIDED IN MANY STEPS, FOR MARKETING DEPARTMENT WHICH ONE IS MOST IMPORTANT? 1.COMPANY WAREHOUSE 2. DISTRIBUTORS 3. RETAIL SALES ?

i believe retail sales is important to maintaining marketing , and it's most effective if done in coordination with professional manners

1-  company warehouse is the most important 

3) Retail Sales

all are important but retail sales suppose to be more important for marketing department.

RETAIL SALES & POST SALES ARE THE REAL INTEREST OF MARKETING DEPARTMENT TO MAINTAIN CUSTOMER,S SERVICE DEPARTMENT .

Retail Sales , almost everyone agrees to it.

Complete sales process is important, difficult to choose any one of it. However, if I have to go with one then it will definitely be Retail Sales. 

3) Retail Sales

If the warehouse has enough space to fill in combined with adequate source to feed it:  the main concentration would be  a two way approach on Retail outlets to make them aware of the product potential; and with Distributors to associate with them.

Distribution to maximise "REACH".

I believe that all are of vital importance. But it must be kept in mind that without (1) Company warehouse the latter would be difficult to complete. With an organized warehouse you have a great understanding of your products and their availability. Such details are vital for distribution and sales.