two shipping options flat rate and free

Hello all I was hoping for some help on this, I wanted to offer my customers a flat rate shipping charge when they order 20.00 or more in merchandise and free shipping when they order over 40.00....

I have found how to do this with the free shipping over 40.00 but not the flat rate over 20.00....

thanks in advance

What happens when the Order is under $20.00 ...:unsure:

regular shipping amount based on weight..... oh yeah I guess I will need that to... but that is how it was set up originally shipping cost based on weight....

You could customize the Flat Rate flat shipping module:
/includes/modules/shipping/flat.php

with the code in RED using:

      // disable only when entire cart is free shipping
      if (zen_get_shipping_enabled($this->code)) {
        $this->enabled = ((MODULE_SHIPPING_FLAT_STATUS == 'True') ? true : false);
      }

// bof: allow only for orders of >= $20.00
// Only allow Free Shipping when whole cart is Always Free Shipping
  if (!IS_ADMIN_FLAG && $this->enabled) {
    global $cart;
    $chk_total = $_SESSION['cart']->show_total();
    if ($chk_total >= 20.00) {
      $this->enabled = true;
    } else {
      $this->enabled = false;
    }
  }
// eof: allow only for orders of >= $20.00

      if ( ($this->enabled == true) && ((int)MODULE_SHIPPING_FLAT_ZONE > 0) ) {

that would be good... however editing code is above my pay grade , is there anyway of doing it through zen admin?

I am afraid not ... the code has to be customized ...