Hello,
You have a setting "link product quantity" which tell HikaSerial to modify the quantity of HikaShop products depending to the serial quantity stock.
www.hikashop.com/support/documentation/1...ration.html#main_adv
If you do pre-generate your serials and do not use a plugin generator ; that setting is what you need.
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.