I'm using Excel 2003

Hi,

What I'm trying to achieve is that when I change a cell in column A, let's
say A5 (but the code should work for any cell in column A), into a certain
pre-set value. e.g. "XX", "Y" and "BBB" should trigger the code, but any
other input should not trigger the code.

When I enter one of those pre-set values, the cell of the same row in column
H (so H5 in this case) should equal the entries that I'm going to enter in to
column F (F5 in this case)

When I remove these pre-set values entered in column A, the entire process
should be undone.

Thanks in advance,

Paul.