As of Jan 2019, Webflow does not support nested Collection Lists, which makes common list-of-lists presentations difficult.
A common example of this is a list of Venues, each with a list of upcoming Events. Fortunately, if the relationship between Venues and Events is one-to-many, then this nesting limitation can be overcome with little strategy and a bit of script.
Here I'll show you exactly how to do that.
Webflow does not allow us to nest a Collection List within an item of another Collection List.
However, we can create two separate Collection Lists on the same page, and then stitch them together using script.
It's important to understand that this approach can only work when you are using the Webflow CMS's Reference field. The Multi-Reference field will not work because there is no way within the designer to emit the hierarchy of information you would need.
In this example design, we'll use the Venue-has-Events example, with the following 2 CMS Collections;
The page design would look like this-
Where venue-id-1 is your embedded Venue Slug. We use the slug because it is the best "unique key" we have available to describe the Venue.
This DIV will become the container for the events, once those events are "moved" by jQuery into the Venue. More on that soon.
Then separately, below your Venues Collection List, you create your Events Collection List-
Where venue-id-1 is the embedded-field Slug of the linked Venue.
Once the two Collection Lists, and their HTML Embed-created DIVs are in place, we have everything we need to identify our Events, the Venue they belong with, and exactly where in our HTML we want to move them to.
At this point all the jQuery needs to do is stitch them together.
On page ready, we want to select all of the Event DIVs, and relocate them to their corresponding Venue Events DIV.
And BOOM, we're done.
In English that reads as;
See this in action in a Webflow site.
Look at the project code in that Webflow site.
Experiment with the jQuery script in Codepen.
Original solution in a Webflow forum discussion.