1. In Dynamics 365, navigate to Settings | Solutions | Packt | Processes and click on New.

2. In the Create Process dialog, enter the following details:
   • Process name: Update Activities
   • Category: Action
   • Entity: Account
   • Click on OK

3. In your workflow dialog, under Hide Process Arguments, click on the + and create an input argument with the following details:
   • Name: AccountGuid
   • Type: String
   • Required: True
   • Direction: Input
   • Description: Parent Account GUID related to the activities to be updated.
4. In your workflow steps, click on Add Step and select the following custom workflow activity created in the previous recipe:

Packt.Xrm.Entensions | 
  Packt.Xrm.EntensionsUpdateActivitiesWorkflow 

5. Click on Set Properties, and, in the Update Activities dialog, set the AccountGUID value using the right Form Assistance by selecting Arguments under Look for, followed by AccountGuid from the next dropdown, then click on the Add button followed by the OK button at the bottom. The value will show {AccountGuid(Arguments)}, as shown here:

6. Click on Save and Close.
7. Click on the Activate button.