Linking Multi relationships

Hello I am working on an app that is used for Performance Management, so one of the requirements is each employee position must have kpas linked to it with custom score for each position then each kpa has many kpis which also have a score. So currently I have the position displaying and the position kpas, displaying in a relationship manager, now I want when I click on each position kpa that is showing in relationship manager to be able to add kpis for that selected kpa.