<div class="row">
    <div class="col-lg-3">
        Fixed content
    </div>
    <div class="col-lg-9">
        Normal scrollable content
    </div>

</div>

<div class="row">
    <div class="col-lg-3 fixed">
        Fixed content
    </div>
    <div class="col-lg-9 scrollit">
        Normal scrollable content
    </div>

 </div>

.fixed {
        position: fixed;
        width: 25%;
}
.scrollit {
        float: left;
        width: 71%
}