PHP - Como agregar columnas de manera dinamica y que se sumen por fila y columna?

<table style="margin: 0 auto;">

	<thead>

		<tr>

			<th scope="col" colspan="7" style="text-align: center;"><b>REPORTE DE LIQUIDACION DIARIA<b></th>

		</tr>

		<tr style="text-align: center;">

			<th>Descripción</th>

			<th><select name="c1" style="width: 180px;">

					<?php

					  if (!isset($_SESSION['ti'])) {

								$_SESSION['ti'] = $_REQUEST['ti'];

							}

							if ($_SESSION['ti']===NULL){

							}else{

								echo  $pal = $_SESSION["ti"];}

						$sql="SELECT * FROM usuario

						      where id_tienda='$pal' and id_cargo='6'";

						$consul= mysqli_query($cone,$sql) or die(mysqli_error($cone));

					?>

					<option value=" " style="text-align-last: center;">Elija un cajero</option>

					<?php foreach ($consul as $opc): ?>

						<option value="<?php echo $opc['nombre_us'] ?>"> <?php echo $opc['nombre_us'] ?> </option>

					<?php endforeach ?>

		        </select></th>

			<th style="text-align: center;">TOTALES</th>

		</tr>

		<tr style="text-align: center;">

			<th scope="col">Venta contado</th>

			<th><input type="text" maxlength="15" id="n1" name="n1" onkeyup="vc();format(this)" onchange="format(this)"  value="0"></th>

			<th class="ct">L.<input class="tt" id="vct" type="text" onkeyup="format(this)"  readonly value="0" /></th>

		</tr>

		<tr style="text-align: center;">

			<th scope="col">Venta credito</th>

			<th><input type="text" maxlength="15" id="vcr1" name="vcr1" onKeyUp="vcr();format(this)" onchange="format(this)"  value="0"></th>

			<th class="ct">L.<input class="tt" id="vcrt" name="vcrt" onkeyup="format(this)" type="text" readonly value="0" /></th>

		</tr>

		<tr style="text-align: center;">

			<th scope="col">R. abonos credito</th>

			<th><input type="text" maxlength="15" id="rat1" name="rat1" onKeyUp="ra();format(this)" onchange="format(this)"  value="0"></th>

			<th class="ct">L.<input class="tt" id="rat" name="rat" onkeyup="format(this)" type="text" readonly value="0" /></th>

		</tr>

		<tr style="text-align: center;">

			<th scope="col" class="ct">Totales ventas</th>

			<th class="ct">L.<input class="tt" id="total1E" name="tt1e" onchange="format(this)" type="text" readonly value="0" /></th>

			<th class="ct">L.<input class="tt" id="totalE" onchange="format(this)"  type="text" readonly value="0" /></th>

		</tr>

		<tr style="text-align: center;">

			<th scope="col">Efectivo</th>

			<th><input type="text" maxlength="15" id="efec1" name="efec1" onKeyUp="efe();format(this)" onchange="format(this)"  value="0"></th>

			<th class="ct">L.<input class="tt" id="eft" name="eft" onkeyup="format(this)" type="text" readonly value="0" /></th>

		</tr>

		<tr style="text-align: center;">

			<th scope="col">Cobro en cheque</th>

			<th><input type="text" id="cc1" name="cc1" onKeyUp="cc();format(this)" onchange="format(this)" maxlength="15" value="0"></th>

			<th class="ct">L.<input class="tt" id="cct" name="cct" onkeyup="format(this)" type="text" readonly value="0" /></th>

		</tr>

		<tr style="text-align: center;">

			<th scope="col">V./Plla. empleados</th>

			<th><input type="text" id="ve1" name="ve1" onKeyUp="ve();format(this)" onchange="format(this)" maxlength="15" value="0"></th>

			<th class="ct">L.<input class="tt" id="vet" name="vet" onkeyup="format(this)" type="text" readonly value="0" /></th>

		</tr>

		<tr style="text-align: center;">

			<th scope="col">V./Plla. socios</th>

			<th><input type="text" id="vs1" onKeyUp="vs();format(this)" onchange="format(this)" maxlength="15" value="0"></th>

			<th class="ct">L.<input class="tt" id="vst" name="vst" onkeyup="format(this)" type="text" readonly value="0" /></th>

		</tr>

		<tr style="text-align: center;">

			<th scope="col">Ventas al credito</th>

			<th><input type="text" id="vac1" onKeyUp="vac();format(this)" onchange="format(this)" maxlength="15" value="0"></th>

			<th class="ct">L.<input class="tt" id="vact" name="vact" onkeyup="format(this)" type="text" readonly value="0" /></th>

		</tr>

		<tr style="text-align: center;">

			<th scope="col">Notas al credito</th>

			<th><input type="text" id="nc1" onKeyUp="nc();format(this)" onchange="format(this)" maxlength="15" value="0"></th>

			<th class="ct">L.<input class="tt" id="nct" name="nct" onkeyup="format(this)" type="text" readonly value="0" /></th>

		</tr>

		<tr style="text-align: center;">

			<th scope="col">R./Caja chica</th>

			<th><input type="text" id="rc1" onKeyUp="rc();format(this)" onchange="format(this)" maxlength="15" value="0"></th>

			<th class="ct">L.<input class="tt" id="rct" name="rct" onkeyup="format(this)" type="text" readonly value="0" /></th>

		</tr>

		<tr style="text-align: center;">

			<th scope="col">C./en efectivo</th>

			<th><input type="text" id="ce1" onKeyUp="ce();format(this)" onchange="format(this)" maxlength="15" value="0"></th>

			<th class="ct">L.<input class="tt" id="cet" onkeyup="format(this)" type="text" readonly value="0" /></th>

		</tr>

		<tr style="text-align: center;">

			<th scope="col" class="ct">Totales ingresos</th>

			<th class="ct">L.<input class="tt" id="total1M" name="1m" onchange="format(this)" type="text" readonly value="0" /></th>

			<th class="ct">L.<input class="tt" id="totalI" name="tit" onchange="format(this)"  type="text" readonly value="0" /></th>

		</tr>

		<tr style="text-align: center;">

			<th scope="col" class="df">Diferencia</th>

			<th class="df">L.<input class="tt" id="difet" name="dif1" onchange="format(this)" type="text" readonly value="0" /></th>

			<th class="df">L.<input class="tt" id="dift" name="dift" onchange="format(this)"  type="text" readonly value="0" /></th><br>

		</tr>

	</thead>

    </table>

<?php

include "conexion/db.php";

$code= $_POST['c5'];

$a= $_POST['a1'];

$b= $_POST['a2'];

$c= $_POST['a3'];

$d= $_POST['a4'];

$e= $_POST['a5'];

$f= $_POST['a6'];

$g= $_POST['a7'];

$h= $_POST['a8'];

$i= $_POST['a9'];

$j= $_POST['ab1'];

$k= $_POST['ab2'];

$l= $_POST['ab3'];

$m= $_POST['ab4'];

$n= $_POST['ab5'];

$query="insert into caj_ldi(user, vc, vcr, rabo, efe, tcat, tsta, cc, ve, vs, ver, nc, rcc, ce, fecha) values('$code' ,'$a', '$b', '$c', '$d', '$e', '$f', '$g', '$h', '$i', '$j', '$k', '$l', '$m', '$n')";

$resul= $cone->query($query);

}

if($resul){

    echo "Datos guardados correctamente";

    header('Location: http://'.$server.'/Proyecto/Menu');

}else{

    print '<script>';

	print 'alert("No fue posible guardar los datos");';

	print 'location.href="http://'.$server.'/Proyecto/ldi';

    print '</script>';

?>

//------SUMA DE TOTALES----

function c1(){

  //SUMAR TOTALES VETICAL:

  var t1 = parseFloat(document.getElementById("n1").value.replace(/,/g, '')) || 0;

  var t2 = parseFloat(document.getElementById("vcr1").value.replace(/,/g, '')) || 0;

  var t3 = parseFloat(document.getElementById("rat1").value.replace(/,/g, '')) || 0;

  var resut = t1 + t2 + t3;

  resut.toFixed(2);

  document.getElementById("total1E").value = resut;

  format(document.getElementById("total1E"));

  difg();

  total_ventas();

}