YITH WooCommerce Product Bundles allows you to create your custom bundles with the products of your shop and offer custom pricing or discounts.
The integration with YITH WooCommerce Multi Vendor lets you give every vendor the possibility to create their own bundles and include their own products in them.
Just make sure you’ve installed and activated the premium version of both plugins.
Then, also your vendors will be able to create bundle products using their own products:
For more details about how to configure your bundled products with YITH Product Bundles, please, refer to the official documentation.