The bulk actions dropdown which is part of the WooCommerce 'Add/Edit Product' screen is very limited because you can’t select which variations to edit. WooCommerce Bulk Variations extends this by letting you filter the list of variations by a wide range of criteria. You can select exactly which variations you want to edit. Next, use the bulk actions dropdown to edit the selected variations in bulk.
This method is perfect for changing any type of data about your product variations. For example, you can change the variation prices, sale prices, variation images, stock status, set sizes and dimensions, manage sales and discount periods, and much more.