Can I make sure that I am clear what you want?

Are you asking whether it is possible to create a drop down list that will
change dynamically as the user enters something into a cell? If so, then I
do not believe that this is possible; according to Microsoft, a data
validation can only be used for the following - 

/    * Make a list of the entries that restricts the values allowed in a
cell.
    * Create a prompt message explaining the kind of data allowed in a cell.
    * Create messages that appear when incorrect data has been entered.
    * Check for incorrect entries by using the Auditing toolbar.
    * Set a range of numeric values that can be entered in a cell.
    * Determine if an entry is valid based on calculation in another cell.
/
(https://support.microsoft.com/en-us/kb/211485)

If you do know of a way this can be accomplished using Excel directly, can I
ask you to post the instructions here please? That way, someone can have a
go at re-creating these steps with POI and help you that way.



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