I have two sections in a user interface - "Top section" and "Bottom section"
"Bottom section" - is a data grid with at least 100 rows x 100 columns. I guess the requirement is that when we change a value in a cell the corresponding row with all its values is added to the "Top Section". And now in the "Top Section" you can make changes to the values as well for that row.
So let us say you updated 4 values in 4 different rows in the "Bottom Section", the "Top Section" will now have 4 rows and will allow you to change the values as well.
I guess we can provide a button to clear all the changes that were made to "Top Section", how should we name the button? "Undo All" - "Clear All" - "Reset All".
Again, from application perspective, the idea is to query the server and get the latest data when we click that button.