@Aravind punugoti​ I don't think so any such feature is currently available where you can merge the cells from one or more notebooks. Secondly there is no such feature to copy multiple cells from excel into the cells of databricks notebook.

Multiline editing is available; you just need to press CTRL and click on the places where you need to make an edit. While executing a particular cell, if we try to execute some other cell we will get 'Waiting to run' but won't get which cell is currently running. Use exception handling if you want the cells to be executed further.