Add text dependant on radio button

Do you want the user to be able to override these texts in the text fields, or should they be determined solely based on the selection in the radio-button group?

++EDITED REPLY

Hi there @jlehane ,

Although my preferred method would've been to employ a single script in one of the textfields as a Custom Calculation Script, I would stick to answering your original inquiry by employing a script for each of the radio buttons in use.

For the scripts (which are illustrated below) to work properly, you must assign an different export value to each of the grouped radio buttons under the heading of 'Group3' (i.e first radio button assign export value of "X", second radio button "Y", and third radio button "Z" respectively). 

So, with no further delays, very quick and easy, just copy the script below and paste it in the first radio button Mouse Up event script editor:

var f = event.target;

if(f.isBoxChecked(0)){

this.getField("selfA").value = f.value;
this.getField("60A").value   = "";
this.getField("150A").value  = "";

}

Use this script for the second radio button:

var f = event.target;

if(f.isBoxChecked(1)){

this.getField("selfA").value = "";
this.getField("60A").value   = f.value;
this.getField("150A").value  = "";

}

And use this one for the third radio button:

var f = event.target;

if(f.isBoxChecked(2)){

this.getField("selfA").value = "";
this.getField("60A").value   = "";
this.getField("150A").value  = f.value;

}

NOTES:

In the example scripts above, I employing the isBoxChecked() function method to test for the 'checked' status property of the radio button widget that a user will be clicking on. 

Rather than using a conditional expression to check for the "Off" export value (when a checkbox is unchecked), this method returns a value of zero(0) if the radio button is unchecked, and a value of one(1) if it is checked. Manually assigning a desired export value to each radio button is used instead to display that value automatically in the desired textfields (eliminating the excessive use of variable declarations).

Note that, you have three radio buttons grouped together under the 'Group3' heading. In other words, f.isBoxChecked(0)  represents the first radio button under the 'Group3 heading, f.isBoxChecked(1)  represents the second radio button, and f.isBoxChecked(2) the third radio button respectively. Therefore, the declared varibale "f" in the expression, it tells the script in which target field  the 'checked' event will execute from.

I hope that this clarifies a few things.

Additional Suggestion:

You may want to consider employing an Action Button to reset the checked status of the radio buttons and to clear the textfields (if desired).

Otherwise, radio buttons widgets are designed to work in groups, and once the user clicks on any of those radio buttons to make a selection, that last selection will always stays active. In which case, employing checkboxes may be more desireable.