> For the complete documentation index, see [llms.txt](https://resources.less.tech/less-tech/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://resources.less.tech/less-tech/modelling/action-guides/merge/stack.md).

# Stack

<figure><img src="/files/3TfdPBtL95uaPsbBYMdM" alt=""><figcaption><p>The Stack Action</p></figcaption></figure>

A simple action for merging similar data sets. The Stack Action stacks columns with identical column names on top of each other. See it in action below.

{% embed url="<https://www.loom.com/share/4e5580043d064a88adea18df90f7e219>" %}