well you can do it in two ways, populate the list from lets say a spread
sheet or put it in the properties
for the later, you would rightclick on combo box, click properties and hit
the middle tab for values
you need to define the field so hit for example New then type a name and
probably text and text. Choose a list type, property to use should be value
and possible values are the values you want to use. Separate the values by
a semicolon. When you run the form, the values will then be in the
combobox.