I have a range "rows F$12:F$60" and if F4 (which is the sum of the range) is
= than the control "$C$4" then the cells format red and then I want that
range to lock. This is repeated up to column CW i.e. for range G$12:G$60 if
G$4 is =$C$4 the range is locked, etc, etc,

Looking through some of the previous examples I imagine that I would have to
set some sort of loop for each column that increments but I dont know how.

I previously asked to try to get it to lock based on conditional formatting
but the response was that this was not possible.