I am developing a multi-grouped report. Base on the level of a group, I am to set the bottom border width to 2pt else 1pt. I only know how to set the default for all groups. I have googled and tried various expressions but unable to get around the requirement.
 An example of what I want to achieve is shown in the image below
 [![enter code here](https://i.stack.imgur.com/F855x.png)](https://i.stack.imgur.com/F855x.png)