To skip every other row when copying a formula in Excel, follow these steps:

1. Enter your formula in the first cell where you want to apply it. In your case, you would enter
   Code:

   "=A1"

   in cell B1.
2. In the cell below the one where you entered the formula (in this case, cell B2), enter the number "2".
3. Select both cells (B1 and B2) and drag the fill handle (the small square in the bottom right corner of the selection) down as far as you want to apply the formula.
4. Release the mouse button and you should see that the formula has been applied to every other row, skipping the rows where you entered the number "2".
5. If you want to adjust the range of cells where the formula is applied, you can select the cells where you want to apply the formula and drag the fill handle again.

That's it! You should now be able to skip every other row when copying a formula in Excel.