Hello,
You can add such kind of filter in HikaShop order listing and HikaMarket order listing via the plugin system.
www.hikashop.com/support/documentation/6...onBeforeOrderListing
HikaMarket uses the same trigger than HikaShop but you can check if the application is running in the backend or the frontend to make the difference of context.
onBeforeOrderListing($paramBase, &$extrafilters, &$pageInfo, &$filters, &$joins, &$searchMap)
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.