Please follow the below steps to bulk update listings into sales channels from Selro. This step will work for any new listings as well as existing listings.
Please go to Inventory -> Manage Inventory and go to the 'Active Listing' tab.
From the channel filter, please select the channel that you want to update.
Bulk select the items up to 1000 and click 'Update to Channel' and follow the steps.
This will update the full product details to the select sales channel.
