I am trying to Hide Columns based on a drop down list answer if it appears on any row

Is it possible to Hide columns based on the values from a drop down list in individual rows. For example, I am creating a report that has descriptions of expenses and if "Mileage" is selected from a drop down list, then columns h through k should be visible and if any other type of expense is selected, then those columns should be hidden. This is an example of the code I wrote where the macro works on cell D11, but I am looking for this macro to work with a range of D11:D:32 if possible where if the word Mileage is included if even just once, then those columns can be included in the worksheet:

Private Sub Worksheet_Change(ByVal Target As Range)
If Range("d11") = "Mileage" Then
Columns("h:k").Select
Selection.EntireColumn.Hidden = False
Range("d11").Select
Else
Columns("h:k").Select
Selection.EntireColumn.Hidden = True
End If

End Sub

Please advise

Thank you John, that is very close to what I am looking for, the initial code that I included was flawed in that I was only limited to the last cell that included the range which in my case was one individual cell. The only issue that I am now having is that lets say I select "Mileage" in Cell "D11", the columns would be visible which is what I want but then lets say I selected "Airfare" in Cell "D12", the columns that I wanted to appear when "Mileage" was selected are now hidden again. Is there a way to have this sheet set up so that if the word "Mileage" is selected those columns will be visible regardless of what is in the rest of the range, and if "Mileage" is not selected at all then those columns remain hidden?

Thanks for your help so far!