Hi,
You can use the CSV Import to import new products ; it can also import variants in the same time.
You can use a mass action and the CSV import to do something similar.
Otherwise, when you create a product and you want to generate your variants ; you can select several values in the "nameboxes" (select your 10 sizes and 5 colors) ; HikaShop will create all different possibilities.
You can alos use the "duplicate" button to copy a variant by changing one characteristic (you have to check variants in the list to unlock the "duplicate" button ; and you can also select several values in the namebox).
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.