Hi Murat,

Thank you for getting in touch! Yes, it's possible to set wholesale prices based on brands using B2BKing's dynamic rules functionality.

While the default rule conditions are based on products, categories, and tags, you can also set up rules using custom taxonomies like brands. 

To do that, add this code snippet to your site:

add_filter('b2bking_dynamic_rules_taxonomy_option', function($val){
    return 'brand';
}, 10, 1);
add_filter('b2bking_custom_taxonomy_backend_name', function($name){
    return 'Brand Name';
}, 10, 1);

You should then be able to see brands available in dynamic rule configuration:

Let me know if I can help.

Kind regards,
Stefan