How to clear iMessage history on iPad

[iMore Question]

On the left side shows name and messages right shows convo how can I clear the right side and leave left side as is I know it can be done because I've done it before somehow but don't remember how I did

 

[mpham2]

You hold down on a message on the right side and a box should open that says more. Push more and delete all or you can erase separately.