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, select Bundle products in the option Vendor can sell available in YITH > Multi Vendor > Vendors > Vendors permissions.
Now, your vendors will be able to create bundles with their own products.
For more details about how to configure your bundled products with YITH Product Bundles, please, refer to the official documentation.