- Using tab Filters filter all products by product type - variable
- If you have a lot of variations per product (>10) set products per page no more than 5 to avoid server 500 error. And it is better to activate columns only which you need for your current bulk operation.
- On tools panel activate switcher 'variations'
- Now if you open tab Bulk Edit all visible fields will be able to edit "products variations" only, ignoring their parent-products