If you need to remove all products variations from all variables products of your shop:
- In the Filter select product type 'variable' and filter by it
- After filtering on the tools panel click on button 'Variations Advanced Bulk Operations'
- There go to tab Deleting and select 'Delete all products variations'
- Click on 'Start deleting' button and wait until deleting finished
If you need to delete the product variations from the products of any product category - in the tab Filter also select category (or their combination) you need!
Also if there is only some products which you can see on one page - do not use Filtering - select variables-products using checkbox and do the same another described above.