A Combo Box question is similar to a checkbox question (otherwise known as a multiple choice, multiple answer question) except that it uses a select box rather than checkboxes in order to ask the same question. The advantage of using this question type rather than a checkbox question is that it displays a long lists of choices in a better format (i.e. appears shorter – with a scroll bar). In other words, this question type is similar to a dropdown question in that it allows you to display a long list of choices in a smaller screen area but also allows you to select multiple answers rather than just one.
How to Use:
Below is a video on checkbox questions, where you may find some relevant information:
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