I didn't find an answer to this, but maybe I didn't use the right terms for my search. So I'm sorry if this is a duplicate.
Anyway, my situation is this: the company I work at manages a lot of sites (100+), and we've recently put them all into Google Webmaster Tools under my Google account, which was tedious enough. Now two coworkers are supposed to be added as users for each site, so they can see the data and manage stuff there as well. But I can only find an option to add users for a single site, not for all sites that are currently associated with my account.
Do I really have to go through more than a hundred sites one by one and add the two users to each of them, or is there some way to add both users to all/multiple sites at once?