conditional logic (i can't describe)

Hi, how do i set this up in typeform / conditional logic if this is what i want:

Question 1: Choose A, B, or C

If A:
Question A1. xxx
Question A2. xxx
Question A3. xxx

If B:
Question B1. xxx
Question B2. xxx
Question B3. xxx

If C:
Question C1. xxx
Question C2. xxx
Question C3. xxx

Ending.