If you were using Excel, this solution would work:
Try pressing CTRL and the Minus key
simultaneously, or Right Click and
You'll have to specify whether the
remaining cells get shifted left or up
when the selected cells are deleted.
The way you phrased your question, I thought you were using Excel, not Access.
I think the issue is that Access is fundamentally different from Excel. Even though an Access table looks like a spreadsheet, is not a spreadsheet of cells... it is a table of rows and columns. You can delete entire rows or entire columns (fields), but you can't delete "cells" in the middle of a column or row like you do in Excel. In many cases, you can erase the data in a given set of row / column intersections, but you'd have to do them one row at a time. (BTW, deleting "cell" data in Access really means you are setting the value to NULL, which in database terminology means there is no value stored.)
I hope this helps!