mass action with two datas

Hi,

No, that's not possible.
I suppose that you're saying that because you actually want to update products based on the user group of the vendor of the products.
That would require a filter added to the "product" data by HikaMarket.
But there is nothing for now to do something like that.

Hi,

I don't understand what you mean ?

Hi,

It's not possible, but even if it was, I don't see how you want to connect users and products.
Users and products are not directly connected in HikaShop. And even the only indirect connections are through the carts or the orders (a user has carts/orders which have products).