There are a few different ways that you can add multiple vendors to your Shopify store.
One way is to install the Shopify Multivendor app. This app allows you to add multiple vendors to your store, and each vendor has their own dashboard where they can manage their products and orders.
Another way is to use the Shopify Product Vendor app. This app allows you to add multiple vendors to your store, but each vendor will need to create their own products and add them to your store.
You can also use the Shopify Custom Store app. This app allows you to create a custom store for each vendor, and the vendors can manage their own products and orders.
If you want to add multiple vendors to your store, you can use any of these apps.