Hi,
For the moment, it is only possible to set one warehouse for a shipping method.
Or "no warehouse" in order to authorize the shipping method for all warehouses.
We will see to improve it in the future but it is not something which can be done easily, it will require some important modifications and a lot of tests (not something we can do in few minutes or few hours).
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.