I have a website with several zones (banner sizes) which run tons of campaigns, etc. Nothing fancy.
We've decided to add sponsored articles for some of our clients. For those articles, we would like to make it so only banners from that client (a single campaign) show up. I know of the "Companion positioning" feature, but as far as I know, it doesn't let us choose a specific campaign to run on those pages.
If this is not possible I've thought of creating zones for every single client of ours but that would be a lot of work.