Then just try it on your Sketch.
- Create 2 Artboards
- Rename the two Artboards to “Tab Bar/Base”, “Tab Bar/Home”
- Make both of them to Symbol
- Create another Artboard and apply Symbol.
- You will find that the two Symbols you created were in a folder which is called “Tab Bar”. It makes easier to organise your Symbols.
Does it make sense now?