I wonder what i can use the extended fields for in our campaigns. This seems like a very useful feature but I cannot figure out how to work it. I've set up a few extended fields now and I can see their values when looking at the subscriber list. But, whre can I use those fields in the application? To me those fields make only sense if I can send newsletters to subscribers who have selected a given field value for instance. How would I do that?

I was thinking of exporting the list to excel and then re-import in another list only those with the given selected value, but there must a more elegant way of doing this I hope?