This feature already exists. For more information on this, please refer to this article: https://university.webflow.com/article/conditional-visibility

Hope this helps :)

Old thread, but for people finding it now (like I did):

A conditional field is not the same as conditional visibility of an element. We can use conditional visibility to show/hide an element based on a field condition. But what is disappointing is that we can NOT create conditional fields within the collection, where a field only appears as an option if another field has been enabled. This is what the original poster was asking about. Not visibitly.

Yeah, this does NOT exist – obviously the team has misunderstood the idea.

This ticket needs to be updated, (solution doesn't already exist) see Denise's D comment below

I think that what he's asking for is different than what was already developed. I'd like for the site administrator to be able to build a collection and only be given certain options if a previous option has been selected.

This feature already exists. For more information on this, please refer to this article: https://university.webflow.com/article/conditional-visibility

Hope this helps :)