Create a new connection

1. Navigate to the Setup icon and select Marketplace.
   
2. Click Connections under Marketplace and then Create Connection.
   
3. Click Default Services under Pick your service.
   
4. Select Zoho Projects.
   
5. Enter Update Task Status as the Connection name and select the scopes ZohoProjects.tasks.READ, ZohoProjects.projects.READ, ZohoProjects.tasks.UPDATE
   
   
   
6. Click the Create and Connect button.
   
7. You will be prompted to connect to the newly established connection
   
8. Click the Proceed button.
   
9. The connection will be created once the accept button is clicked.
   
   

Workflow rule for automatically updating a Task

1. Click in the top navigation bar.
   
2. Navigate to Task Automation and click Workflow Rules .
   
3. Click New Workflow Rule.
   
4. Enter the workflow name, description, and select the required layout.
   
5. Under Execute on, choose 'Update' then Choose 'Field Specific and Select 'Status' from drop down menu.
   
6. Click Next.
   
   

Create and associate the custom function to the workflow

1. Now, create a custom function and associate it with the workflow rule.
   
2. Click on Add Action and then select Associate Custom Function.
   
3. Click Create Custom Function in the Associate Custom Function page.
   
4. In the Create Custom Function page type in the function name as Update Task Status.
   
5. Add Arguments for project id, portal id, and milestone id as shown in the image below.
   
6. Use this as the Sample Code and click Save.
   
7. Associate the created Custom Function.
   
8. Click Save Rule.