Yes, In your case, you can simply use MAX or MIN funtion, so it will take the selected value. Also you can use SELECTEDVALUE.
Yet, in general to be able to have different measures based on the slicer, you need to nest them in switch.
You can create a parameter table hosting the options with datatable, no need for relationship with other tables.
Have your measures ready for each option and then use SWITCH and SELECTEDVALUE together and nest your measures inside.
This video explains it in two ways thoroughly