We will cover topic about how to add drop down menu to buttons using Bootstrap classes in this tutorials. Adding a dropdown to button very simple, wrap the entire button and dropdown menu in the class .btn-group. Also use <span class="caret"></span> to act as an indicator that the button is a dropdown. Below mentioned code of example shows a basic single button dropdowns:
Split button dropdowns with the same general style as the separate button but add along with the dropdown. Split buttons have the key action on the left and a toggle on the right that shows the dropdown.