Multi email subject and email content to send INV to customer

Summary:
Multi email subject and email content for different group of customer for different purpose

Content (please ensure you mask any confidential information):

Hi,

Currently, I have setup the email subject and email content in Manage Receivables System Options in order to send the AR INV, DN and CN to the respective customer according the email stored in customer profile.

However, all the customer will be send under the same email subject and email content no matter the group of customer is under different customer class / collector.

And in Manage Receivables System Options, there is no other field that I could assign the another email subject and email content for the same business unit.