Default Inventory Management -
If you want "SureDone" to manage the inventory updates automatically, you can select "Shopify" option from the drop-down options for "Default Inventory Management". This is a default setting and will apply even if you don't select any option for inventory management in the product editor page.
How to update this field via UI from single product editor page -
How to update this field via BULK -
If you want to update this field via bulk, the bulk header is "shopifyinventorymanagement" and the value should be set to "shopify". Submit the bulk file with headers such as action=edit, guid and shopifyinventorymanagement and skip all channels except Shopify.