@Prabhu4284 When I run Notebook B (which defines a function) it is still not defined in Notebook A. Are you sure we can import all things (functions, variables, etc.)? It appears from the Databricks documentation that only strings can be shared between Notebooks and pointers to data.

I declared a function in notebook commonFunction and called it from other function just by giving this command:

%run ./CommonFunction

I went ahead and used the function defiend in other notebook

infact o could access the variable defined in other notebook and vise versa too.

https://youtu.be/QpsSYxRg8G8

I have a programming background so restarting my kernel every and running things top to bottom was always common sense to me. I do agree though that it can be misleading and people may not make that assumption. I think one flaw with his programming style at the end that notebooks solve is having the history of how you checked your data throughout the process.

Of course you can, in your primary notebook, use the %run magic command followed by the path or name of the notebook file you want to run, like this:

%run /path/to/other_notebook.ipynb

absolutely you can.
there is databricks documentation explaining everything you need to know here: https://docs.databricks.com/notebooks/notebook-workflows.html

YES. You can use this script to do it

%run ./path_to_other_notebook