> For the complete documentation index, see [llms.txt](https://onboxapp-onbox.gitbook.io/onboxapp/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://onboxapp-onbox.gitbook.io/onboxapp/modify-elements/join-elements.md).

# Join Elements

Join structural and non structural elements

![The Join Elements Dialog Box.](https://1515823925-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-Lga_i3Obkwb7iGSAwzP%2F-Lgvc8jzSgLQ0o3Af8M9%2F-Lgvch9Wro5i_CnO-lWV%2Fimage.png?alt=media\&token=914cd8a2-ec25-4ff9-8370-6158a542d863)

**First Category:** The Instances of this Category will be joined to the instances of the Second Category.

**Second Category:** The Instances of this Category will be joined to the instances of the First Category.

{% hint style="info" %}
You can Join Walls, Columns, Beams or Floors between themselves.
{% endhint %}

{% hint style="info" %}
You can also use this tool to Unjoin Elements
{% endhint %}

**From Level / To Level:** Lets you filter what elements will be joined by specific Levels. 

![](https://1515823925-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-Lga_i3Obkwb7iGSAwzP%2F-Lgvdtzg8tJ5WMc74rth%2F-LgvdyY7Gid-Y3ePdviT%2Fjoin.gif?alt=media\&token=a386f47b-edc1-4dde-b058-add786582327)