Use the Update Attributes tool to change one or more attributes in your products. This tool allows you to apply significant changes across a large group of products.
Steps to update product attribute in bulk
On the Admin sidebar, go to Catalog > Products.
Select the products for which you want to modify sources.
Browse or search to find the products and select those checkboxes.
Click the Actions menu at the top and choose Update Attributes.
Select products to be updated
Update the attribute, advanced inventory, or website data for the selected products, according to your needs.
When finished, click Save.
Bulk updating for attributes