N Numeric

N1.0 means 1 space width

N2.1 means 2 spaces before decimal point and 1 space after decimal point

(Note please refer to the software and how it requires the data to be formatted)

C Character  

Reference category

-If you know your reference category from before, then make sure it is either the first code or the last code. Eg.

The reference category for type of roof is RCC, then code it as 1. RCC and all the other roof types can be in any order