This is very straightforward. Move the cursor GRADUALLY toward the cell to be copied until it turns into an ARROW. Then SELECT the contents of that box and press CONTROL-C. Move the cursor sequentially to each of the ten target boxes and type CONTROL-V to paste the copied text into the target boxes.
Of course, in the time it took you to contact JA and await an answer, you could simply have typed the text into the other ten boxes!!