is it possible to modify the possible values of MultiSelectMany fields through API ?
Is there something like :listModifyCustomField ?
Unfortunately you can't do that via the API at this point. We've had this feature requested a few times, so I've added a vote for you.
For now, you'll have to make these sort of changes through the app.
From Australia to Zimbabwe, and everywhere in between, companies count on Campaign Monitor for email campaigns that boost the bottom line.Get started for free