Hello,
The options are elements which need to be set for every products.
If you want that all vendor products have the same "product options", you can use the HikaMarket feature called "product template".
A "product template" is a product that you can configure in the backend and when a vendor will create a new product in the front-end, the template will be used in order to pre-fill elements.
Depending the access level you have configured for your vendors, it is also possible to use the template to "force" some elements that the vendor do not have access for edition.
The "product template" can also be used to pre-set the characteristics (in order to create variants afterwards).
Generally speaking, for shoes, it's best to use a characteristics for the shoe size and then to create variants for the different sizes.
But the best would be to create a topic in the HIkaShop section of the forum that part (and also for the configuration and the display of the taxes).
In the HikaMarket section of the forum, I can help you with the configuration of the usage of HikaMarket, how to configure the access level or all which is related to the front-end edition and the vendors.
Regards,