If a user chooses selection A, B, C, D in drop down box 1, the 3 possible selections change in drop box 2 that correspond to item chosen in drop down box 1.
If user chooses the "Starter" plan in drop down box 1, the user is shown three selections in box 2 of $7, $8, $9.
Yet, if they choose the "Pro" plan in drop down box 1, the user is shown three selections in box 2 of $20, $30, $40.
Anytime a user changes box 1, box 2 must change instantly. No matter how many times box 1 is changed. The script must work flawlessly.
I need it FAST.