In order to create your own Smart List, you will need to first enable Custom Smart List:
1. Sign in TickTick on the web.
2. Click the Avatar on the top left corner of the left sidebar, then click Settings from the menu that appears.
3. Select Smart List, then select to Show Custom Smart Lists.
4. A section for Custom Smart Lists will then appear on the left sidebar. Click Add Smart List to create a new Smart List.