Dynamic Data Validation

[SystemsAccountant]

Hi,

I have a question on the above but can't seem to find a solution.

There are two ways that I can find for dealing with dynamic lists via data validation:-

1) Offset and match, cavet being the data must be sorted a-z
2) Have lists for each potential selection

Is there any way to get around 1 without having to do 2?

E.g. Got two columns of data, unsorted, and a list from which the user can choose from. The user chooses from the list in first cell, in the second cell require the dynamic list to return all the values accordingly?

Thanks
Matt