---
sourceDocument: Yokohama IT Operations Management
sourceDocumentLink: https://servicenow-prod.fluidtopics.net/r/yokohama/it-operations-management

 Release :

    - yokohama

ft:locale :

    - en-US

ft:publication_title :

    - Yokohama IT Operations Management

ft:clusterId :

    - itom

bundleId :

    - itom

workflow :

    - Technology


---

# Extend Cloud Provisioning and Governance resource blocks with an override operation

# Extend Cloud Provisioning and Governance resource blocks with an override
operation {#ariaid-title1}

* Release version: Yokohama
* 
* Updated January 30, 2025
* 
* ![](https://www.servicenow.com/docs/portal-asset/ico-clock) 1 minute to read

You can extend your existing guest interface to create a new operation. You can also
create a new guest interface with its own operations, parameters, and inputs.

## Before you begin

Become familiar with resource block input parameters, operations, and steps. See
[Configure resource block input parameters](https://servicenow-prod.fluidtopics.net/a3rmNFQiFcZ2~~ilHHC5rA "You can configure operations for each interface of a resource block by specifying input parameters, steps, and output attributes. Input parameters hold values that the system requires to identify and manage a virtual resource, such as the datacenter and resource group that the resource is in.") and [Add operation steps to a resource block](https://servicenow-prod.fluidtopics.net/1T_VwQDPodRU5nRDtu3HxA "After you configure operations and input parameters for your resource block, add steps for each operation to tell the system which Cloud API (CAPI) to call. Each step is a separate call to CAPI.") for instructions.

Role required: sn_cmp.cloud_admin

## About this task

The Cloud Provisioning and Governance application is bundled with several useful
resource blocks. Create extensions to the existing resource block interfaces to add
more functionality to these resource blocks. After creating an interface extension,
use it in a blueprint to execute a customized operation. For example, if you do not
like the way a virtual server is provisioned, extend the virtual server resource
block interface by adding operations or overriding existing operations.  
Note:  
Operations in resource blocks are also called operation signatures.

## Procedure

1. Open a resource block.
2. Change the status of the resource block from Published to Draft.
3. Click the Operations tab.
4. Click the Override Operation icon.  
5. Select an existing guest interface or select the Create new check box to create a new guest interface.
6. **Optional:** If you create an interface, enter a name in the Interface field.
7. Click Submit or Update.  
   The new operation appears in the Operation list. If you create a new interface, it appears in the Interface list.
8. Configure the necessary input parameters, steps, and output attributes for your new guest interface.
9. To edit the operation or to change the access type:
   1. Click the Edit Operation Signature icon.  
   2. Change the Operation Type if necessary, and add, edit, or remove input parameters at the bottom.
   3. If you want the blueprint designer to perform the operation directly on the resource only when it is instantiated, select Private for the Access Type.
   4. Click Update.
10. After completing the customizations, toggle the switch to Published.
11. Navigate to Cloud Admin PortalDesignBlueprints.
12. Follow the steps in [Build a Cloud Provisioning blueprint](https://servicenow-prod.fluidtopics.net/EFg~MX6L_NVB5~4R31bKpg "Use the blueprint designer to create custom blueprints for the Cloud Provisioning and Governance application. Blueprints are deprecated in the Orlando release.") to add a blueprint.
13. Click Operations and click the operation to modify in the resource block.  
    The default resource block interface appears in the right column.
14. Click the Edit Resource Operation (pencil) icon to apply the interface extension you created.
15. Click Submit.  
    The blueprint gets executed with the customized interface extension.

## Result

After you add this resource block to a blueprint, the parameters you added are
available for you to customize.

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