You can find this section in HostBill Admin → Clients → Register New Customer.
You can create new client profile from admin area by using Register new customer button. You will need to provide customer details (as per registration form). You will also be presented with following configuartion options:
You can find this feature under Clients → Manage Clients → Register New customer → Import From CSV.
Start by downloading sample CSV - this way you can check what fields are possible to import, and how to prepare CSV file.
One you have your csv file ready click on Upload your CSV file button, select your CSV file and click on Import - HostBill will begin import process. Customer e-mail is used as unique field, If duplicated emails are detected, HostBill will skip them.
Note: