this can be done but will require hand coding to accomplish and is not supported.
you would need to capture the value from the number field and store it in a variable, then create a loop around the insert record behavior to perform the insert that many times:
<?php
if($_SERVER["REQUEST_METHOD"] == "POST") {
$count = $_POST['numberField'];
for($i = 0; $i < $count; $i++) {
?>
<insert record code>
<?php
}
}
?>
if you need help accomplishing this, I would suggest signing up for a premiere ticket appointment.