Okay, got the basics, an entry on the tools menu. Now, I'm stumped. I
need this:

User clicks column header to select all cells in perticular column,
then click on Tools - MyAddin.

This addin needs to iterate through each cell, reading it's value.
Then, I need to write another value to a cell on a different sheet,
after creating a new sheet. I'm finding very little documentation on
this and starting to pull out hair.

Thanks,
Jody