Hi there – we have a similar request. We are using Retool as an assortment planner for product bundles. We have a couple of layers of data we’d like to iterate through. Bundles have a size (we sell clothing), a number of distinct items in the bundle, and then a variation (A, B, C, D). We want to be able to display the bundles but grouped by their top-level categories. So the first listview would have a row for each size. Then the second nested would have a row for each # of items, and the third would be the variation version.