# Node for grouping a list and summing it's values

**URL:** https://forum.dynamobim.com/t/node-for-grouping-a-list-and-summing-its-values/76848
**Category:** Revit
**Tags:** revit
**Created:** [May 24, 2022, 9:02am UTC](https://forum.dynamobim.com/t/node-for-grouping-a-list-and-summing-its-values/76848 "2022-05-24T09:02:05Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![smrema](https://avatars.discourse-cdn.com/v4/letter/s/b782af/32.png) [@smrema](https://forum.dynamobim.com/u/smrema)
#### Post date: [May 24, 2022, 9:02am UTC](https://forum.dynamobim.com/t/node-for-grouping-a-list-and-summing-its-values/76848/1 "2022-05-24T09:02:05Z")

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Hello,  
What node do i use to group a list based on it’s name and sum the values. Foristance in the attached picture, list 25 (CL Concrete\_panels) and list 26 (concrete, cast in situ) would be combined under one list concrete and their sums (63.757 and 60.328) be summed

 ![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/9/3/93870ad7a96d8effa0ad90c70a8ded8c892cc59b.png)

I have attached my dyn file for more reference

[summaterials.dyn](https://forum.dynamobim.com/uploads/short-url/mKCRmNLCJ9JjbK2dVyLaEc8z8co.dyn) (27.9 KB)

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### Author: ![Daan](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/daan/32/82246_2.png) [@Daan](https://forum.dynamobim.com/u/Daan)
#### Post date: [May 24, 2022, 9:22am UTC](https://forum.dynamobim.com/t/node-for-grouping-a-list-and-summing-its-values/76848/2 "2022-05-24T09:22:39Z")

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Hi @smrema ,

See if something like this helps you out:

 ![screen](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/a/2/a2499bb6d612de752a00e219f8f079136b1c67f2.png)

Just make sure the Code Block contains all the unique material-keys you could have.

[2022-05-24 Group and sum by key.dyn](https://forum.dynamobim.com/uploads/short-url/iyEMKkxItvoZ4xZivkVbdS9lBqz.dyn) (13.0 KB)

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<div class="post-metadata">

### Author: ![smrema](https://avatars.discourse-cdn.com/v4/letter/s/b782af/32.png) [@smrema](https://forum.dynamobim.com/u/smrema)
#### Post date: [May 24, 2022, 4:25pm UTC](https://forum.dynamobim.com/t/node-for-grouping-a-list-and-summing-its-values/76848/3 "2022-05-24T16:25:07Z")

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Thanks @Daan it’s working 😃