There are dropdowns (comboboxes from the Forms toolbar) and comboboxes (from the
Control toolbox toolbar).
In either case, show the appropriate toolbar.
Click on the icon (both say "combo box")
When you move the cursor off the toolbar and on to the worksheet, the cursor
will look like a + (plus).
Click where you want to locate that combobox and then drag to the opposite
corner.
Now here comes the difference.
If you chose the Forms version:
right click on it and choose Format Control
on the Control Tab, you can specify both the "cell Link" and the "Input range".
This cell link will return an index into that input range.
You can get the text in that dropdown (combobox from the Forms toolbar) by using
a helper cell.
Say my input range is A1:A10 (more than you need in your case).
My linked cell is B1.
then in C1, I could use this formula:
=index(a1:a10,b1)
or maybe better:
=if(b1="","",index(a1:a10,b1))
If you chose the Controltoolbox version:
Use the design mode icon on that same toolbar.
rightclick on your combobox
select properties
Look for linkedCell (for the linked cell <bg>)
look for Listfillrange (for the "input range" for this version)
There's no need for a helper cell in this case. That cell will have the value
of what's in the combobox.
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Just some hints when you're positionining the combobox/dropdown:
Use the Alt key to snap-to a cell border. Use the Shift key to keep it in the
same vertical/horizontal plane.
You can find some more manipulation tools on the Drawing toolbar (click on the
Draw icon and you'll find Nudge, snap, align, and more).
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And why the different objects for stuff that looks almost the same. The
dropdowns came first. The comboboxes were added in xl97. So they hang around
for compatibility with old workbooks.
But I find the dropdowns (from the Forms toolbar) much easier to work with. But
they have a lot fewer customization capabilities--both for formatting and macro
use.