There is no mouse-over event with cells etc...
Moreover I would say that physically altering the content of the sheet by virtue of moving the mouse is a very risky approach - far better to rely on a very deliberate action on the part of the end-user.
If the copy range is constant (B3:B103) then why not use say a Double Click event on A1:Q1 ?
To insert the above, right click on sheet of interest select View Code and paste into resulting window.
Thereafter in a macro enabled file - double clicking on any cell in range A1:Q1 will populate B3:B103 with that value.
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