In this particular video we have explained about Big- Commerce Connector feature app which helps the marketplace sellers to connect their BigCommerce stores with the admin’s Shopify store.
Also, sellers selling on BigCommerce can auto-sync their products with the admin’s marketplace. Also, the sellers can import their products from BigCommerce to Shopify.
Accordingly, inventory will be managed at both ends once an order is created/updated for the seller’s product at BigCommerce or at Shopify.
Refer to this guide for the Big-Commerce Connector:
https://webkul.com/blog/bigcommerce-connector/