In addition to Will's comments - if you added all the data together into one column are you likely to exceed 65556 rows?
What you're asking to do is fairly straightforward to code BUT it's efficiency will be largely dependent upon the volume of data we're talking about...(though I guess it would still be preferable to doing it manually!).
Another option would be to import your Excel data into Access and then return all the data to one book using SQL (again pretty straightforward to code I think).
Good luck!!!
Awaiting next instructions...