Please follow the below steps to bulk import new stock file and add the new stock levels into Selro inventory and update the stock levels into sales channels. Please note that the new stock file must only contain new stock quantity rather than the total quantity.
Please go to the inventory -> Stock In view
Click 'Upload Stock In' button and this will show the below page. Please prepare the new stock CSV file with SKU and QTY columns. Please add only the new stock quantity for each SKU and not the total quantity and upload this file. This will increase the inventory stock levels with the new stock values and update to all the sales channels that are connected to Selro.