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This way you can reference any field in the related form, like to reference field "t2" you will write [entry.sm.t2] or just sm.t2 if used in ConfiForms Field macro
UPDATE
Since version 1.16 you can reference ANY field from a referenced Smart field, that means: when you have a reference to other form you can easily get any field values from that form though this reference. Our value finding methods are now much more advanced and allow you to do that.