Are you trying to access functions inside those other notebooks? Or are you trying to run other notebooks such that certain things are setup before you run this new notebook?
I'm not sure if this is what you're looking for but give this a try. You might be able to tweak it to get what you need:
note: I've only been able to successfully do this using the advanced notebook runtime. Currently looking into why it doesn't work in standard notebooks.
1. Install the ipynb module:
pip install ipynb
2. Check that it installed correctly and is the latest version (0.5.1)
pip list
3. Get the item ID of the existing notebook you want to reference in the new notebook (found in the URL of the notebook item)
4. import the notebook like so:
import ipynb.fs.full.itemID as customName
5. You should now be able to access the functions defined in that notebook
customName.functionName(x,y)
If instead you'd rather run the entire notebook, you could encapsulate the logic inside a main() function and call main() using this method.
I've demonstrated the workflow below. Let me know if this is what you're after.
Existing functions notebook:
New notebook to call inside of: