This is a very simple logic
Your solution is here on jsfiddle.
follow the link to get the full working code.
here is usage and best way to accomplish your aim in respect to your question:
$(function() {
//========= Funct to Scroll box #1 n #4
$('a#box1').on('click', function() {
$('#small-box1').ScrollTo();
$('#small-box4').ScrollTo();
});
//========= Funct to Scroll box #2 n #5
$('a#box2').on('click', function() {
$('#small-box2').ScrollTo();
$('#small-box5').ScrollTo();
});
//========= Funct to Scroll box #3 n #6
$('a#box3').on('click', function() {
$('#small-box3').ScrollTo();
$('#small-box6').ScrollTo();
});
});