Want to convert multiple values of single key into array

I have an array which contains multiple values on single key. Now want to convert those values into nested array. Please help me with this.

Welcome to the Make community!

Every result (item/record) from a iterator/search/match module will output a bundle. To “combine” them into a single structure, you’ll need to use an aggregator of some sort.

Aggregators are modules that accumulate multiple bundles into one single bundle. An example of a commonly-used aggregator module is the Array aggregator module. The next popular aggregator is the Text Aggregator which is very flexible and has applies to many use-cases.

There are other types of aggregator modules, click the below links to find out more: