Like this ? http://jsfiddle.net/CBZZU/5/
HTML :
<div class="section group green">
<div class="col span_1_of_4 left">
<div>floatleft - </div>
</div>
<div class="col span_3_of_4 right">
<div class="section group">
<div class="col span_1_of_3 ">
To be placed on extreme left
</div>
<div class="col span_1_of_3 ">
To be placed on center
</div>
<div class="col span_1_of_3 ">
extreme right
</div>
</div>
</div>
</div>
CSS:
.green {
background:green;
}
.left {
float:left;
background:blue;
}
.right {
width:100%:
float:right;
background:red;
}