Need Help with Drop down menu

The concept is the same. Use a validation script on the dropdown to set the  border color of the fields you want highlighted, depending on the selection.

Here's a template for how your code should look. Put this code in custom validation script for the dropdown. You'll need to change the field and list items names, and fill in the missing fields and selection options. 

// First hide all field borders
this.getField("Field1").strokeColor = ["T"]; 
this.getField("Field2").strokeColor = ["T"]; 
... etc. (repeat for all affected fields)
// Next highlight the field borders, depending on the current selection
switch(event.value)
{
   case "Selection#1":
     this.getField("Field1").strokeColor = color.red; 
     this.getField("Field2").strokeColor = color.red; 
     break;
   case "Selection#1":
     this.getField("Field3").strokeColor = color.red; 
     this.getField("Field5").strokeColor = color.red; 
     break;
}