Download the file and then go to import 

Upload the file 

Create a Vendor→ Enter the name of the vendor and import the data file.
Please select your character encoding for CSV files based on your Country/region.

Map the entities and preview import, the mapping details are as follows:
customer_name→Customer Name
Customer-id→Customer ID
Product Sku→Product SKU or ID
Product name→Product Name
licenses→License count

Verify the mapping and import the data

Delete the dummy entry

Go to configure→ CSV vendors ,you would be able to find your vendor.