Insert Into Existing Table

I have a table which contains the following fields:
WORKER,SUB SYS,JAN-08,FEB-08,MAR-08
I want to insert into this table each month the data from the second table for that month
can someone tell me how to do this...each time I try the secnd table data TOTAL strarts a new row below the ones that are already there...hard to explain. I tried this and it didn't work:

INSERT INTO [ORACLE SORA ALERTS BY WORKER] ( [JAN-08] )
SELECT A.TOTAL
FROM A INNER JOIN [ORACLE SORA ALERTS BY WORKER] ON (A.SYS = [ORACLE SORA ALERTS BY WORKER].[SUB SYS]) AND (A.WORKER = [ORACLE SORA ALERTS BY WORKER].WORKER);

WORKER SUB SYS JAN-08 FEB-08 MAR-08
0000A CRT
0000A ENF
0000A FIN
0000A RAP
000AT CRT
000AT ENF
000AT FIN
000AT RAP
000AX CRT
000AX ENF
000AX FIN
000AX RAP
I have a second table which contains the following fields:
WORKER,SYS,TOTAL

WORKER SYS TOTAL
0000A CRT 1
0000A FIN 21
000AX CRT 1
000AX ENF 2
000AX FIN 11

What I want is to move the numbers in the TOTAL COLUMN INTO THE MONTH/YEAR COLUMS IN THE FIRST TABLE. Would look something like this:

WORKER SUB SYS JAN-08 FEB-08 MAR-08
0000A CRT 1
0000A ENF
0000A FIN 21
0000A RAP
000AX CRT 1
000AX ENF 2
000AX FIN 11
000AX RAP