Hi!
Using the Combobox from the Forms toolbar:
Combobox located in a worksheet; rightclick the combobox and select "Format
control", then you can set the Input range and cell links in the Control
tab.
Combobox in a Userform; read
http://support.microsoft.com/?id=161598 for
details.
If the Combobox is from the Control Toolbox, then you have to use VBA
(doubleclick on the combobox in Design mode, and you will open Visual Basic
Editor.
Best regards
Stefan Hägglund
Microsoft