> For the complete documentation index, see [llms.txt](https://support.who-umc.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.who-umc.org/vigilyze/settings-and-customisation/custom-groups/create-a-custom-reaction-group.md).

# Create a Custom reaction group

Custom reaction groups allow organisations to create and manage predefined groups of reaction terms  for efficient case retrieval.

To create a Custom reaction group:

1. Open the User menu.
2. Open **Custom groups**.
3. Locate **Reaction group**.
4. Click **Create new**.
5. Enter a group **Name**.
6. Add Preferred terms of interest.
7. Click **Save**.

The new group becomes available throughout the organisation.

#### When should I use a Custom reaction group?

Custom reaction groups are useful when:

* Monitoring specific clinical concepts, such as Adverse Events of Special Interest (AESIs)
* Performing recurring analyses
* Supporting organisation-specific workflows
* Standardising searches


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