Hi,
You can use the multiple interest codes with the same customer or customers group.
Follow the below configuration to run the process:
1- Set the following parameters to be used for the interest calculation
Accounts receivable parameters > Collections > Interest and Fee
2- Credit and collections > Interest > Setup interest codes
Create the interest codes and assign the GL posting account
3-Assign the posting profile to customer groups
link the interest code with customer posting profile
4- test the scenario by creating the sales order with that particular customer group customer account.
