Get the related subform records

Get the related subform records

I have a main form called Creative Media Calls in Zoho Creator that has a products/service subform.

How can I loop through the related subform records of the products/services.

i.e.

for each related subform record{
 check the service selected
}

I found how to getAll() the subform records, however I just need the related subform records of the parent form record.

Thanks for your help with this,

Thomas