Set Custom Prefix for wholesale users

Hi . I have installed your plugin . We have been using this plugin for long without any issue . But currently we wanted to set prefix ‘WH’ for wholesale customers . We have already have a prefix ‘MT’ using your plugin . But we want to additional have another prefix for wholesale customers . It will be like ‘MT-WH-order_number’ . How can I apply this ? Could you suggest me any way ? You can suggest me any code to establish this .