You can create customer from Income/Customer or Income/Csutomer Invoice/Create New Invoice/Create New Customer
- click at Income/Products/Add new record
- key in the product code.
Press [Enter] to submit
- key in the details
a) Income account: select the account you want to credit when selling this product. e.g.: Sales
b) Expense account: select the account you want to debit when buying this product, e.g.: Purchases