Required narrative if any check boxes are selected

[MTSMITH110]

I am trying to create a fillable document with multiple tiers with check boxes, and if any of the check boxes in that tier is selected, I would like the narrative field below that tier to become required. 

For example: 

Tier 1:

• Selection 1
• Selection 2
• Selection 3
• Selection 4
• Selection 5
• Tier 1 Narrative

Tier 2:

• Selection 6
• Selection 7
• Selection 8
• Selection 9
• Selection 10
• Tier 2 Narrative

What I'm looking for is if any of Sections 1-5 are selected, Tier 1 Narrative becomes required, and if any of Selections 6-10 are selected, tier 2 narrative becomes required, and so on and so forth. 

[Nesa Nurani]

Let's say checkboxes are named "Selection 1" to 5, use this as custom calculation script of Tier 1 text field:

var req = false;
for(var i=1; i<=5; i++){
var f = this.getField("Selection "+i).valueAsString;
if(f !== "Off")
req = true;}
event.target.required = req;

For other tiers, adjust loop like this for tier 2: for(var i=6; i<=10; i++){

[try67]

Be aware the required property is only enforced when the file is submitted, not when saved, printed, emailed, etc.