1.9 Goods Volume/Value Coming Into/Out of Various Sea Ports

Should these sections be at level 3 (###) rather than level 2 (##)?

Outline:

1. Sea Port Function
2. Top 25 Tonnage Ports in 2020
3. The busiest container ports in the United States
4. Sea port goods movement
5. Container Sea Ports
6. Container Terminal Structure
7. Goods movement in Seaport
8. Sea-port Logistic