So something like this ??

Code:
LOAD DATA
INFILE 'z:\PREVIOUS_ADDRESS.dat'
TRUNCATE INTO TABLE PREVIOUS_ADDRESS
(YOUR_COL  POSITION(001:004)  INTEGER EXTERNAL  CASE WHEN :YOUR_COL = 9999 
                                                            THEN 9999
                                                            ELSE 12*trunc(:YOUR_COL/100) + mod(:YOUR_COL,100)
                                                            END,
 PA_INCOME        POSITION(005:019)  CHAR                
)