Hi,
I'm not sure we are using the same words.
"Specification" in HikaShop is a product custom field ; at that's something provided in commercial edition of HikaShop.
So I suppose that you're talking about characteristics (and variants).
In that case, you have to create the variants in the product edition ; just go in the second tab of the product to access to the variant manager.
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.