We just went in the order that's on the checklist. So for example, question 3 says to include documents A, B, C.
We wrote the question as it is on the checklist including the proper number and then under it, in a bullet list, all the things we included. Like so:
3. Attach documents A, B, C
- Document A
- Document B
- Document C
Later on, where they ask you for additional relationship proof, we did the same.
Copy paste the exact wording of the question, copy paste the wording of the sub category (such as, maybe this is the part where you're including letters from friends and family) and then list all the documents in order (in this case, letter from parents, letter from friends XY, letter from friend Z, etc). Same goes for any bills, insurance policies, titles, anything at all that we included. We listed them all in order as they're requested (and we arranged them in the package in that same order).