Hi,
HikaMarket does not allow yet the edition of the shipping methods in the front-end.
You can configure the shipping methods in the backend and assign a shipping method to a specific vendor.
Assigning a shipping to a warehouse is like using a warehouse. The products will be split and each "group" will have his own shipping method list.
If you are using the UPS shipping method, please check that the options to process the package are right. If you do not "group package", each product will be send separately and the shipping cost become very high.
We didn't update the shipping documentation yet (for the warehouse and multi-vendor) but if you have question about it, do not hesitate to ask for.
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.