Update copy in a set of display ads

Hi,

I've been using Creatopy as ad generator, but i'd like to move to Express, since we have it and i've noticed lots of improvements. 

I create a few different set of display ads (google/fb/etc), each set has about 10 sizes. I saw how to create a size and then duplicate the ad into different sizes, but I can't find a way to easily update the whole set with new copy or small changes to the copy, once the set is complete. Even changing picture, it seems that i have to go in each size and make changes there. 
Is there a better workflow? am i missing something?

thanks!