Please refer to the below links, If useful then marked as correct and helpful.
Amar D. Savale
Thanks Amar, all great videos and the second link is close to what I want to achieve.
However, the problem I am trying to solve is for the value in the parameter filter to be derived by the user selection from the KPI metric list. There are about 20 different KPI metrics in the list to pick from and each will either be numeric or percentage. Therefore, if the user picks a KPI metric which is a numeric score, I want that to pass a true / false (or some other Boolean) value to the parameter filter so a further selection by the user is not required. Hope that makes sense and hope you are able to help.