Dropdown combo box

is it possible to have a drop down combo box consisting of specified checkboxes in excel so that users can select a few options from a drop down box via check box?

for example, i would like a cell to have a drop down box, which is a field that displays the qualifications a particular graduate holds, for example, a graduate might have BSc in IT and a BSc in Maths
whereas another might have BSc in Maths and BEng in Civil Engineering, so there are a variety of combinations...is this possible? or how should this be achieved?