Hi, I need to populate a listbox, however, the value on the
second box needs to derive from the first one, such as when I click on
North America, USA and Canada would show up. the tricky part is that
I need to be able to select North America and Europe in the same time
and 2nd list box needs to show USA, Canada, UK, Italy, German
accordingly.
thank you
A1: North America
A2: Europe
A3: Asia
B1: USA
B2: Canada
C1: UK
C2: Italy
C3: German
D1: China
D2: India
...
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