How to change the workflow in existing items using the PowerShell Script?

But the already existing item will not be affected. Because Sitecore never changes existing items by itself.

Solution:

To apply the new workflow to existing items We can use the Powershell script.

Script:

In this script add the location after "$contentsToUpdate = Get-Item master: -Query" to apply workflow likewise in my case all items under the home will be updated to the new workflow.

In "$content.Fields["__Default workflow"].Value" and "$content.Fields["__Workflow"].Value" add your workflow Item Id.

In "$content.Fields["__Workflow state"].Value" add your workflow default status Id.

When the Script runs successfully it returns the "True" value for each item and the workflow will apply to all items otherwise it returns the "False" value.

Mitesh Patel || Chief Technology Officer (CTO) | ADDACT

Sitecore AI Certified || XMCloud || OrderCloud Certified

Mitesh Patel is the Chief Technology Officer (CTO) at Addact with 12+ years of experience in enterprise CMS, digital experience platforms, and cloud-native application development. He specializes in Sitecore, Contentful, Strapi, Kentico, Umbraco, Contentstack, and .NET, helping organizations build scalable, secure, and future-ready digital solutions through modern CMS, headless architectures, AI-driven experiences, and cloud technologies.