# Search through multiple Categories for common parameters

**URL:** <https://forum.dynamobim.com/t/search-through-multiple-categories-for-common-parameters/34711>\
**Category:** Revit\
**Created:** [April 11, 2019, 3:02pm UTC](https://forum.dynamobim.com/t/search-through-multiple-categories-for-common-parameters/34711 "2019-04-11T15:02:44Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![mark.hughes3](https://avatars.discourse-cdn.com/v4/letter/m/4491bb/32.png) [@mark.hughes3](https://forum.dynamobim.com/u/mark.hughes3)\
**Post date:** [April 11, 2019, 3:02pm UTC](https://forum.dynamobim.com/t/search-through-multiple-categories-for-common-parameters/34711/1 "2019-04-11T15:02:44Z")

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I am slightly frustrated at my current workflow in acquiring lists of parameters from elements of multiple categories.

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**Author:** ![mark.hughes3](https://avatars.discourse-cdn.com/v4/letter/m/4491bb/32.png) [@mark.hughes3](https://forum.dynamobim.com/u/mark.hughes3)\
**Post date:** [April 11, 2019, 3:09pm UTC](https://forum.dynamobim.com/t/search-through-multiple-categories-for-common-parameters/34711/2 "2019-04-11T15:09:48Z")

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I have been looking for a way to query groups of Category’s elements and capture the parameters from them. Until now I have been trying many different directions. The firs was to build a node that queried the elements based on the input of the Category type.

This had to be multiplied many times to acquire all of the results.

I have also resorted to some Python scripts for selecting multiple categories. I am pushing my limit. Has anyone found a way to select multiple categories and query them at the same time?

 ![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/c/4/c425650844be30191406344742fe62d1af866112.jpeg)

 ![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/f/7/f7d1d51b0e8287425441cf6ef18583763d796bd2.jpeg)

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**Author:** ![kennyb6](https://avatars.discourse-cdn.com/v4/letter/k/7ba0ec/32.png) [@kennyb6](https://forum.dynamobim.com/u/kennyb6)\
**Post date:** [April 12, 2019, 1:23am UTC](https://forum.dynamobim.com/t/search-through-multiple-categories-for-common-parameters/34711/3 "2019-04-12T01:23:12Z")

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Hello.  
Is the custom node not working when you input a list of lists? Can you show us the outcome and what you wish the outcome to look like?