# Manage Individual Identifiers

**Requirement**: Immuta permission `GOVERNANCE` or domain-specific `Manage Identifiers`

## Create an identifier

This action can be done within a domain from the **Identifiers tab** to create a domain-specific identifier, or it can be done from the **Identifiers page** to create a reference identifier.

1. Click **Create New**.
2. Enter a **name** and **description** for the new identifier.
3. Click **Next**.
4. **Enter criteria**: Select the [**Type** of criteria](/saas/configuration/tags/data-discovery.md#criteria).
   1. For regex, enter a regex to be matched against column values. The default criteria encoding is case-sensitive. You can change this encoding using the regex criteria. The regex must use RE2.
   2. For a dictionary, enter the values in a comma-separated list to match against column values. Opt to toggle the **Case insensitive** switch to on if you want the dictionary to be case sensitive.
   3. For column name regex, enter a regex to be matched against column names. The default criteria encoding is case-insensitive. You can change this encoding using the regex criteria. The regex must use RE2 syntax.
5. Click **Next**.
6. **Select the tags to apply**: Use the text box to search for a tag or type a tag name to create a new tag under the "Discovered . Entity" hierarchy to apply to columns that match your identifier.
7. Click **Next** to review your new identifier and click **Create Identifier** to create it.

*Note that all user-created identifiers must be a 90% match or greater for the contents of the column to be tagged.*

## Edit an identifier

Editing the details of an identifier from the identifiers page will only affect that identifier; no copies of that identifier will be impacted.

{% tabs %}
{% tab title="Reference identifier" %}
To edit a reference identifier,

1. Click <i class="fa-tags">:tags:</i> **Metadata** in the navigation menu and select **Identifiers**.
2. Click the **more actions** icon of the identifier you want to edit.
3. Select **Edit**.
4. Edit the field you want to change.
5. Click **Save**.

*Built-in identifiers cannot be edited.*
{% endtab %}

{% tab title="Domain identifier" %}
To edit a domain identifier,

1. Click <i class="fa-globe">:globe:</i> **Domains** in the navigation menu and select your domain.
2. Select the **Identifiers** tab.
3. Click the **more actions** icon of the identifier you want to edit.
4. Click **Edit**.
5. Edit the field you want to change.
6. Click **Save**.
   {% endtab %}
   {% endtabs %}

## Delete an identifier

Deleting a domain identifier from the identifiers page will remove it from the domain it is in.

{% tabs %}
{% tab title="Reference identifier" %}
To delete a reference identifier,

1. Click <i class="fa-tags">:tags:</i> **Metadata** in the navigation menu and select **Identifiers**.
2. Click the **more actions** icon of the identifier you want to delete.
3. Select **Delete** and click **Save**.

*Built-in identifiers cannot be deleted.*
{% endtab %}

{% tab title="Domain identifier" %}
To delete a domain identifier,

1. Click <i class="fa-globe">:globe:</i> **Domains** in the navigation menu and select your domain.
2. Select the **Identifiers** tab.
3. Click the **more actions** icon of the identifier you want to delete.
4. Select **Delete** and click **Save**.
   {% endtab %}
   {% endtabs %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://documentation.immuta.com/saas/configuration/tags/data-discovery/how-to-guides/manage-rules.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.