I am trying to set up a Dependent List and am having some difficulty. The
scenario is this

I have a list of Cities to which employees are attached to. I wish to select
a City and then only to be able to select an employee that is attached to
that list. The Cities have a Range Name "CityCol" and the Employees are
listed in columns according to the City they work in, so London employees
are in AA; Berlin AB; Paris AC ... etc

I select the City in C5 - that's not a problem I can do that. I then want to
select an Employee attached only to the City selected in C5 from a drop down
list - this is where I have hit a problem. The formula I have been
attempting to use is with Data Validation - List and is:

=OFFSET(INDIRECT($C5),0,0,COUNTA(INDIRECT(C5&"Col" )),1)

This returns an error "The source currently evaluates to an error"

Don't know if I am even using the appropriate formula

Thanks