In the Chart of Accounts, you can create new accounts when needed.
Go to Finance in the left-hand side
menu. Now go to Accounting > Chart of Accounts, and there is a blue button
New account on the top right side.
A box opens where you can select the Account type in the
dropdown menu, enter the account no. and name and maybe a VAT code. Click
Create, and the account is created and
visible in the Chart of Accounts.