[Forums] Global Find/Replace for a source web block

Hello

I have an espace with over 50 web screens. They all use Common\Footer web block. I want to change all the screens to use a Footer from a referenced espace. I don't seem to be able to do a global find/replace for web blocks. So it looks like i have to go to every page's footer and manually change it.

Is there a better way?

Thank you very much.