Need help with......."this.parent" expressions

I am using "this.parent" expression in buttons for a few functions like clearing text in text fields. but what if I want the same button to clear text in a text field on a different page and/or subform. I know it's not "this.parent" because the text field isn't in the same page or subform as the clear button. what is the alternate script?

Below is the button functions I am using where the button is in the same subform. How do I extend the particular function of a button to perform the same action to fields in another page and/or subform?

Example 1: Delete Instance button

this.resolveNode("Subform1").instanceManager.removeInstance(this.parent.index);
xfa.form.recalculate(1);

Example 2: Clear field(s) button

var f1 = this.parent.somExpression + ".TextField1" + ",";
var f2 = f1 + this.parent.somExpression + ".TextField2" + ",";
xfa.host.resetData(f2);
xfa.form.recalculate(1);