10.1.3. How to create a vendor/ customer

To create a new contact you can go to Accounting-> Customers/Vendors-> Customers/Vendors and then click Create 

From the contact form, provide all the details in your possession: Contact name, email, phone, address, etc.. In the Sales and Purchases tab you can tick Is a Customer or Is a Vendor or both of them. It will indicate that the contact is Customer (see picture below). If the contact is created from Accounting-> Customers-> Customers this box will be ticked automatically. After that, click on Save when you’re done