A template for toggling different input fields based on user selection

RadioButtonTriggeredFields.wl

DynamicModule[{toggle, input = 1},
 toggle[a_, b_] := PaneSelector[{a, b}, Dynamic@input];
 Grid[{
   {
    "First Row",
    RadioButtonBar[Dynamic@input,
     {
      1 -> "Item A",
      2 -> "Item B"
      }
     ], SpanFromLeft
    },
   {
    toggle["Second Row; Item A", "Second Row; Item B"],
    toggle[InputField[Dynamic@input, String], 
     InputField[Dynamic@input, String]],
    toggle[Button["Clear", input = ""], Button["Clear", input = ""]]
    }
   }, Alignment -> Left]
 ]