There are two ways of publishing an application in ServiceNow:

Using an update set

To publish an application using an update set, follow the below steps:

1. Go to System Applications —> Applications

2. Open the relevant application from the list

3. Click on the 'Publish to Update Set' UI action

4. Enter the details and click Publish

5. An update set will be created and it can be imported to any ServiceNow instance and deployed as you would any update set

Note - this process is a bit lengthy and prone to errors as you will need to publish a new update set every time you make changes to the application (or capture and deploy them as individual update sets). We also faced few issues in the past where tables which were extended from Task don't get created properly in the target instance when using this method.

The other alternative is to deploy applications via repository.

Using application repository

The following steps need to be followed for deploying application to the repository.

1. Go to System Applications --> Applications

2. Click Edit beside the Advancement application

This will take you to Studio

3. Go to File --> Publish

4. Change the version to higher than the previous one (if published before), enter the Dev Notes if required the click Submit

5. Follow the progress bar and wait it completes

6. On the target instance, go to System Applications --> Applications --> Downloads tab

7. Click Install and wait till it completes

8. Once completed, deploy your global update set

Note - Uploading an application to the application repository makes this version of the application available to all instances assigned to the same company.

For more details, check the below link:

https://docs.servicenow.com/bundle/jakarta-application-development/page/build/applications/task/t_Pu...