The user can have a requirement of stop sending comment lines to the Accounting system when the orders are importing. That can be done through the retailer settings.

Select the cog --> Retailer Settings --> select the specific retailer

In the specific retailer settings under Importing section you will see an option "Suppress Line Comments". If you select that option the line comments will not import to your Accounting system. once that option is selected select save. 

Please contact if you need further information.