In order to create your own smart list, you will need to first enable "Custom Smart List":
Sign in to TickTick on the web.
Click the avatar on the top left corner of the left sidebar, then click "Settings" from the menu that appears.
- Select "Smart List", then select to "Show Custom Smart Lists".
- A section for Custom Smart Lists will then appear on the left sidebar. Click "Add Smart List" to create a new smart/custom smart list.