The following example demonstrates how you might reveal additional hidden items one at a time. You will need to use the jQuery JavaScript library for this to work.
$('#viewmore').on('click', function(){
$('.item:hidden').show();
})
.hidden {
display: none;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="item">
ITEM 1
</div>
<div class="item hidden">
ITEM 2
</div>
<div class="item hidden">
ITEM 3
</div>
<div class="item hidden">
ITEM 4
</div>
<button id="viewmore">
View More
</button>
</button>
</div>