Yes, I am able to update stock after deleting the "Ship From" attribute. Wherever you decide to purchase/ship the product from is up to the dropshipper. The delete function simply gives you the option to "hide" that information of the product from the customer but the product stock still updates...
You should delete this option (Ship from" when importing products subsequently. For products already added/published, edit item (product). Under product options, select Attributes and hit the delete icon for "Ship from".
You should delete this option (Ship from" when importing products subsequently. For products already added/published, edit item (product). Under product options, select Attributes and hit the delete icon for "Ship from".