This post may provide some additional thoughts on similar posts such as Grid Lines / Grid ByStartPointEndPoint
The beauty I find about controlling Revit via a csv, Excel or database is that it potentially can allow you further flexibility in manipulating points, which in turn can control Revit geometry, with the help of Einar, KolKul, Tomasz and others I have been able to produce a framework to process points from within an Excel file. See How to Control Revit Family via an Excel File?
Attached below is a solution for generating a grid from an excel file, there are only 5 numbers to change in the excel file, and they are highlighted in pink in the excel file, they are; the top left hand co-ordinate to set out the grid, the x spacing, the y spacing, and the extension spacing to the grid bubbles.
If you set out the first bubble ID as A0 or 00 or 0 in a grid bubble of the Revit file, the Grid numbers will automatically number from that sequence when running the Dynamo script.
My question is, rather than resetting the grid sequence starting point, can I, or how can I extract the values set out in the excel table to re-populate and update the grid bubbles ?