Could anyone advise on how to reset or go to a default value of a dropdown from another dropdown?

Could anyone advise on how to reset or go to a default value of a dropdown from another dropdown?

Hi all,

Probably a straight forward peice of code, but I have this form created with RS Forms;


When "Choose Package" is selected and the option "Poniete Playa SC Apartment 2-4 people" is selected, i have a 2nd dropbox called "Add a 3rd or 4th Person".
If a 3rd or 4th person is selected it works great and the totals tally up, however if while a 3rd or 4th person is selected, and then say the "Choose Package", Tropical hotel is selected, the total retains the price as even though I have the option to add a 3rd and 4th person disappears, It still thinks its selected.

So what I need to do is when for the "Choose Pacakage" is selected or any of its options, is to set the second dropbox to the 1st option " -- Add a3rd or 4th person -- " which has a value of nothing, hencing adding up.

Be great if anyone had a snippet I could try

Thian