So, lets use the example in original question (shown below).

If A10 contains the formula =SUM(A1:A9), and the user copies A10, the macro must paste =SUM(A1:A9) in whichever cell the user chooses, say B10.

In order to do this the formula should read

=SUM($A$1:$A$9)

and when it is copied it would read the same.

1. Select the range of cells containing the formulas and press Ctrl+H.

2. In the Find what box, type the = sign.

3. In the Replace with box, type the # sign (to change the formulas to text).

4. Click Replace All, and then click Close.

5. Copy and paste the cells to a new location.

6. Repeat steps 1 through 3, reversing the # and = signs (to change the text to formulas).

From Josel Robins:
http://www.exceltip.com/st/Copying_Formulas_from_a_Range_of_Cells_Without_Changing_the_Absolute_or_Relative_References/694.html

Example copy A1 to B2 keeping all formulas referring to both cells intact:

(1) Copy A1 to a relatively clear position (where no cell reference is off the edge), say D10.
(2) Move D10 the same relative position as the target cell is to the original (down 1, right 1) E11.
(3) Copy E11 to B2.
(4) Clear E11.

This will also work for moving a range of cells too. A macro of this will need to check that the two temporary positions are empty.

Barring that, my next thought was that if we could use your Application class example to trap the Copy event and then modify what actually gets stored in to clipboard. However, I couldn’t find a Copy event anywhere.