Hi,
Could you please provide more information about your problem and maybe, a link to your store so we would be able to understand exactly what is the problem and which override is targeted.
Overrides in Joomla have to follow some rules and conventions in order to have a good working interaction between components and plugins.
But there is a lot of things that you can override.
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.