Data validation lists don't support autocomplete.

If you can use programming, there are instructions here for adding a
combobox from which you can select one of the values from the data
validation list. In the combobox, you can enable autocomplete:

http://www.contextures.com/xlDataVal11.html


breadvan579 wrote:
Hi, I have cell validation working on my spreadsheet whereby when I
click on a cell, a list of contents (named range) is presented for the
user to select which product is required... no problems here

Due to the list being so long (500 products) I would like to use 'type
ahead' type functionality... for example if I want to select the a
product beginning with P I can simple press P and the list would jump
to products beginning with P, as it stands at present I have to scroll
down using the mouse the product that I am searching for.

--
Debra Dalgleish
Excel FAQ, Tips & Book List
http://www.contextures.com/tiptech.html