multi editing price field in configurable product

In configurable product you can fix price variation according to one or more attributes. As example if you have products configured by size, you can have that small size has +5 in price, medium size has +10 and large size has + 20.

I would like to set +5,+10,+20 for all configurable products in one step.
It could be possible selecting configurable products from the main list and modifying the attributes value in the panel Configuring Super Attributes