CS-Cart comes with 100% open source code, so it is highly customizable. You can make any changes in the source code of the software and extend the default functionality. But please keep in mind that all responsibility for possible consequences rests with you. In case of a problem our support engineers will not be able to help you, as they do not analyze the code added by CS-Cart users or third parties. Also, our partner developers would be happy to help you customize your store on a paid basis so that it satisfies all your business needs.