To do this, you have to use COM (Automation). Using VBA, you can open a
workbook, select the worksheet, select a cell or a range of cells, and do any
manipulation you can do working in Excel. This required your VBA skills be
good and that you understand the Excel Objet Model. A couple of hints to
help along the way:
Here is some good info on opening an excel file:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vbenlr98/html/vafctcreateobject.asp
You can use the Object Browser in the VBA Editor to help you along
understanding the Excel Object Model
One trick to get going is to open up an Excel sheet, start recording a
Macro, do manually whatever you want your code to do, stop the macro, go into
the macro editor, copy the code it created, and paste it into your Access
code. It will take some minor tweeking, but it is sure a way to start.