Hi Sacha,
Tanks, I managed to figure this out. Apparently i have to check "Require shipping address" for each products.
I have another problem though. Since i ticked to allow one region in my shipping option, but why the drop down menu still showing other region in the billing address form? I do not want other regions to appear in the drop down menu.
My shop URL is ogrocer.myshopify.com
Thanks
Chee Foong