Hi,
HikaMarket creates the "vendor category" itself if it does not find the category for the vendor.
When you save a vendor in HikaMarket and the option "Create categories for vendors" is set ; HikaMarket will look for the vendor category (a category with the namekey "vendor_" + vendor id (like "vendor_2", "vendor_42", etc)).
If the category is not found, it will create this category under the "Parent category for vendors".
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.