How to bulk edit WooCommerce variation prices? A different price for each size

This is a bulk edit of variation prices in WooCommerce: a different price for each size. Example of the task: user has products like posters with foreground color, background color and poster size. Colors here no matter, matters only size which makes the price. So we have: poster 10x12 for 10$, 15x20 for 14$, etc ... How to set price using bulk editing for each such product variation? Answer:

Using tab Filters - filter "variable products" with category posters if such one exists
If you have about 50 variations per product set products per page 5 to avoid memory fail on the server side. In such cases better activate columns which you need for current operation only!
On tools panel enable 'variations' switcher
Open tab "Bulk Edit" and select there attributes combination(s) you want
Set regular price value (and/or sale price value if you need)
Click 'Do Bulk Edit' button
Wait until the operation finished

Hint: If you have a lot of products with a lot of such "products variations" - you can open WOOBE page in another browser tab wp-admin/edit.php?post_type=product&page=woobe and repeat all steps described above for another combination!

Documentation for BEAR - WooCommerce Bulk Editor and Products Manager Professional: tabs, tools and developer guides