Create a CI class · SN Doc Reader

Create a CI class (table) that is an extension of an existing CI class. Then create identification and reconciliation rules for the new class.

Before you begin

The class that is being extended must have its Is_Extendable field checked, indicating that the class is extendable.

Role required:

sn_cmdb_admin or Itil_admin, and personalize_dictionary: Required for editing the dictionary table
sn_cmdb_admin or admin: Full access

About this task

The CI Class Manager is a centralized location for managing CMDB tables and for creating a class that is derived from another CMDB class. Creating a class requires basic details such as a label and a name. Identification and reconciliation rules are also required to ensure that the class can be successfully identified by the identification engine.

For more information about extending a class and how attributes are derived from a parent class in that process, see .

Procedure

Navigate to All > Configuration > CI Class Manager.
Click Hierarchy to expand the CI Classes list.
Select the class that the new class is extended from.
Click Add Child Class.

The Add Child Class option appears only if the selected class is extendable.
On the Provide Basic Info tab, fill out the information and then click Next.

Field	Description
Display name	A unique label for the class (such as Laptops or Thin Clients). The label appears on list and form views for the class. Updating the Label field also updates the label record in the language file for the current language. See Field Labels in Data dictionary tables.Maximum string length is 80 characters.
Table name	Automatically populated based on the table label and the prefix string 'u_cmdb_ci'. You cannot modify the prefix; however, you can modify the rest of the table name. The name can contain only lowercase, alphanumeric ASCII characters and underscores (_). Maximum string length is 80 characters.
Description	Explanation of the use purpose of the class.
Icon	The icon associated with the class.
Extensible	Indicator of whether this class can be extended.
Principal Class	Denotes whether this class is included in the Principal Class filter. If this class is included in the Principal Class filter, then CIs from this class appear in CI list views when the Principal Class filter is applied.

6. On the **Add Attributes** tab, click the + sign and enter details for each new class column.

Click Next.

For description of the different columns in the list view, see Dictionary entry form. To designate an attribute as a CI identifier for class identification, double-click the attribute's Identification Rule column and set it to true.
On the Set Identification Rule tab, examine the Derived identification rule and its Identifier Entries.

You can click Replace to replace the derived rule with a new identification rule and new identifier entries specific to the new class. See Identification rules for details about identification rules and identifier entries.
On the Dependencies tab, click Add dependency to add dependent rules.

The Dependencies tab appears only if there are dependent identification rules for the selected class.
On the Add Reconciliation Rules tab, click Add to create the following rules:
1. Reconciliation Rules
2. Data Refresh Rules
On the Add Suggested Relationships tab, review the diagram of the class derived suggested relationships.
Use the filter to display only inbound, outbound, or specific relationship types.
To add a suggested relationship for the class:
1. Click New.
2. In the Add Suggested Relationship dialog box, select a Relationship and a Target Class for the relationship. This Class and the Target Class become parent or child in the suggested relationship, based on your selection of the Relationship.
3. Click Save.
When building relationships for the class in the Query Builder, the list of suggested relationships is updated.
Click Done.

Parent Topic:CMDB classifications and class dependency

Related topics

CMDB record types

Related Lists of CI components

Principal Class

Dependent CIs management

View and edit class definitions and metadata

Reclassify a CI

Delete CIs

CMDB Identification and Reconciliation (IRE)

title	Create a CI class
description	Create a CI class \(table\) that is an extension of an existing CI class. Then create identification and reconciliation rules for the new class.
locale	en-US
canonical_url	https://www.servicenow.com/docs/r/servicenow-platform/configuration-management-database-cmdb/t\_CreateCIType.html
release	brazil
product	Configuration Management Database \(CMDB\)
classification	configuration-management-database-cmdb
topic_type	task
last_updated	2026-09-10
reading_time_minutes	5
breadcrumb	CMDB classifications and class dependencyConfiguration Management Database \(CMDB\)Configuration ManagementExtend ServiceNow AI Platform capabilities