Subform field validations in a CRM Module

Subform field validations in a CRM Module

Good day, 

I have difficulty understanding a Subform in a Module.

More specifically:

1. I would like to know if it is possible to get values from a Subform's fields, and HOW to do it with Client Script and/or Custom Function.

2. How can I VALIDATE fields in a Subform, as the Subform itself, or its fields does not show up in the dropdown list of fields when I go to field validations.

I have scoured the internet and any documentation I could find. If anyone out there can point me in a direction, it would be greatly appreciated!

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