Vendors can add and manage their products using the Products section in the Vendor area (Catalog > Products).
To add a new product:
Click the Add new button on the Products page in the Vendor area (Catalog > Products).
Provide information about the product as described here.
Click the Add product button at the bottom of the page to save the product.
Once a vendor has added some products, they can view them as a list in the Products section:
From here, they can access the details of specific products and remove and temporarily disable products. More info about products management you can find here.
The product details view for vendors is similar to that of the store administrator: vendors can control the product's info, product class and attributes, inventory tracking options, product reviews, related products, etc.
Note, however, that vendor’s catalog management capabilities are different from those of the store administrator:
Unlike administrators with the Administrator role, vendors can view and manage only the products they own. Any products added by other users are not visible to them.
Unlike administrators with the Administrator role, vendors do not have access to category management. They cannot create categories and can only add their products to categories created by the store administrator. If the store's list of categories lacks a category that a vendor requires, they need to contact the store administrator to resolve this problem.
Vendors can assign product classes and attribute values the store administrator adds to their products. Depending on how the store is configured, vendors may also be able to create their product classes and attribute values. More information about this is available in Vendor Access to Product Classes and Attributes.