# Filter per field not in the core

**URL:** <https://forum.mautic.org/t/filter-per-field-not-in-the-core/6841>\
**Category:** Product Support\
**Created:** [December 13, 2016, 12:14pm UTC](https://forum.mautic.org/t/filter-per-field-not-in-the-core/6841 "2016-12-13T12:14:49Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![laurentm](https://avatars.discourse-cdn.com/v4/letter/l/c4cdca/32.png) [@laurentm](https://forum.mautic.org/u/laurentm)\
**Post date:** [December 13, 2016, 12:14pm UTC](https://forum.mautic.org/t/filter-per-field-not-in-the-core/6841/1 "2016-12-13T12:14:49Z")

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Hello,  
  
We are considering have a form on our website with language as field where people can indicate if they want to use english or spanish language so we can send them the proper campaign. I don’t see in the filter the possibility to add a field to achieve what we want to do.  
  
How can we filter based on a field which is not in the core of mautic ?

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<div class="post-metadata">

**Author:** ![laurentm](https://avatars.discourse-cdn.com/v4/letter/l/c4cdca/32.png) [@laurentm](https://forum.mautic.org/u/laurentm)\
**Post date:** [December 13, 2016, 12:14pm UTC](https://forum.mautic.org/t/filter-per-field-not-in-the-core/6841/2 "2016-12-13T12:14:49Z")

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Hello,  
We are considering have a form on our website with language as field where people can indicate if they want to use english or spanish language so we can send them the proper campaign. I don’t see in the filter the possibility to add a field to achieve what we want to do.  
How can we filter based on a field which is not in the core of mautic ?