# List Flattening at Level

**URL:** <https://forum.dynamobim.com/t/list-flattening-at-level/42013>\
**Category:** Lists-Logic\
**Tags:** listfilter\
**Created:** [October 17, 2019, 9:57pm UTC](https://forum.dynamobim.com/t/list-flattening-at-level/42013 "2019-10-17T21:57:59Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![PeterNz](https://avatars.discourse-cdn.com/v4/letter/p/e9a140/32.png) [@PeterNz](https://forum.dynamobim.com/u/PeterNz)\
**Post date:** [October 17, 2019, 9:57pm UTC](https://forum.dynamobim.com/t/list-flattening-at-level/42013/1 "2019-10-17T21:57:59Z")

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I am having trouble keeping a list structured when trying to flatten a single index item.

Anyone know how I can flatten List 4 which has 2 sublists so that it produces 2 lists in the parent list?

 ![Lists](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/0/e/0efd53e96d30beebb64d420739def4e50d9455c6.png)  
 ![Lists%202](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/1/7/17c02be31fb9824bdf99a76db5aa14375181ffcf.png)

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<div class="post-metadata">

**Author:** ![PeterNz](https://avatars.discourse-cdn.com/v4/letter/p/e9a140/32.png) [@PeterNz](https://forum.dynamobim.com/u/PeterNz)\
**Post date:** [October 17, 2019, 10:16pm UTC](https://forum.dynamobim.com/t/list-flattening-at-level/42013/2 "2019-10-17T22:16:45Z")

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Sorry realised that the List Join node should be used rather than List Create.