Access the Portfolio functionality in the top menu of functionalities;
Select the "Add Customer" button in the submenu;
Select the customer's country;
Select the additional service to be provided to the customer;
Click on "Continue";
Enter the VAT number of the customer to be invited and click on "Confirm";
Fill in the required information and click on "Continue";
Validate the information provided and click on "Confirm";
Click on "Close".