I am trying to set a change order status to close when the last task is complete
You should be able to do this by doing the following, which is shown in the below screen prints:
1. Go into the workflow that you have defined for the category.
2. Open the 'Group End' task.
3. Click on the 'Complete' status to open it.
4. Click on 'Update Actions on True', select the 'Action' macro type and click search -- then select the 'Set CHG Status Closed' macro.
Retrieving data ...