Hello Rucient,
Thanks for your clarification.
Now we understood your requirement.
We can set the different price by creating some variations etc, but I am afraid, our vendor stuff is a role where vendor can only delegate some / all functionality they have, like adding/updating product, check sales report etc.
In your case, you need to have a new role whole sheller who will be an extended customer who can buy product in a different price than retail via front end. Need some front end restriction so that the whole sheller prices will be available only to them, not general customer.
It will require some customisation above our core to meet your business goal. Kindly let us know if you need any further clarification.