Another option on the customer maintenace group is the Supplier options where you can create suppliers using either this form
The system will automatically add the suppliers through the pre-advice form. It is not necessary to use this form to add them in advance.
However should you want to maintain the details held for a supplier then you can search and open the screen below where you can edit the fields.
It also provides the option to archive the supplier.
The fields are relatively obvious so no explanation is provided
To create a customer the following would need to set up first
Customer Code
Country