Vendor with connected Shopify stores currently they have to import products from their store into a temporary catalogue before selecting products they wish to add to the marketplace operators catalogue, all or selected.
Vendors are now able to choose if they want all products added in their Shopify store to be automatically added to the marketplace operators catalogue, without adding it to a temporary catalogue first.
This option is available to a vendor under Setup > Product Settings from their Dashboard.
Please note: all new products added automatically will appear as "New" products to the marketplace operator, meaning the products will not get auto-published to the marketplace operator's Shopify store until they are approved.
All that is required to the done by the vendor is enable or disable the "Auto add products" button, as below.