If income is less than the permitted exempt amount, HMRC recommends either of the following.
Enter a tick in box 4 and zero in box 31 of the Self Employment (short) pages.
Enter a tick in box 13 and a zero in box 76 of the Self Employment (full) pages.
For this purpose, you don't need to make further entries on the Self Employment pages.
If income is greater, you'll need to decide which of the 2 ways to calculate income benefits your client.