> ## Documentation Index
> Fetch the complete documentation index at: https://help.maestra.io/llms.txt
> Use this file to discover all available pages before exploring further.
# How to Create a Static Customer Segment
To create a static customer segment:
1. Go to **Customer Data Platform** → **Segments**:
2. Click **Create segmentation** → For **customers**:
3. Enter the name and description of the segmentation.
The system will automatically generate the system name and external ID. However, you can also enter your own values.
* The **segmentation name** will be used in the project interface.
* The **segmentation system name** will be used to filter customers in the [Template Engine.](/campaigns/message-template-engine/what-is-the-message-template-engine)
* The **segmentation external ID** will be used in API methods.
4. **Add** relevant segments:
Segmentation cannot be launched without at least one created segment.
5. Click **Launch**:
Once you’ve launched a segmentation, you’ll no longer be able to edit the system name or external ID.
Please note that you can only use segmentations that have been launched. Drafts cannot be used in filters, promotions, messages, etc.
Click **Save and exit** to exit without launching the segmentation.
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You can add customers into segmentation
* [Using filters](/segments/how-to-add-customers-into-a-static-segment-using-ui)
* By importing files (this applies to customers who are already in the database)
* Through flows (Use the *"Include customer in segment"* step within your automated flows)
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A customer **cannot belong to multiple segments** within the same segmentation. When added to Segment B, they are automatically removed from Segment A.