Add Cases to Select Statment

I need to add some cases to the select statment for cpeorderstatus:

Here is my Select statement:

"SELECT O.ORDERID, C.FIRSTNAME, C.LASTNAME, O.CLIENTORDERID AS CRMORDERID, TO_CHAR(O.ORDERDATE, 'YYYYMMDD')
AS CPEORDERDATE, TO_CHAR(O.SHIPDATE, 'YYYYMMDD') AS SHIPDATE, O.TRACKINGNBR AS TRACKINGNUMBER, O.SHIPNAME AS CARRIER,
OI.ITEM AS CPEORDERTYPE, OI.QTY,
O.STATUS AS CPEORDERSTATUS, OSN.ORD_SERIAL_NO AS SERIALNUMBER, C.BTN AS BTN, C.FIRSTNAME AS FIRST, C.LASTNAME AS LAST,
C.SHIPADDR1 AS ADDRESSLINE1, C.SHIPADDR2 AS ADDRESSLINE2, C.CITY AS CITY, C.STATE AS STATE, C.ZIP AS ZIP, TO_CHAR(R.ISSUEDATE,
'YYYYMMDD') AS ISSUEDATE, R.RMA_ID AS RMANUMBER, R.RMA_REASON AS REASON, TO_CHAR(R.RETURNDATE, 'YYYYMMDD') AS RETURNDATE
FROM SELF.ORDERS O, SELF.CUSTOMER C, SELF.ORDERITEM OI, SELF.ORD_SERIAL_NUMBER OSN, SELF.RMA R
WHERE O.CUSTID = C.CUSTID AND O.ORDERID = OI.ORDERID AND O.ORDERID = OSN.ORDER_ID (+) AND O.ORDERID = R.ORDER_ID (+) AND
(C.CUSTID IN (SELECT C.CUSTID FROM SELF.CUSTOMER C WHERE C.BTN='{0}')) ORDER BY O.ORDERDATE DESC"

I need to add multiple cases to cpeorderstatus, five different cases. Cane anyonye HELP

This is really unclear. It looks like you're selecting

O.STATUS AS CPEORDERSTATUS

but you're not doing anything with it other than returning it. Why not simply adding 5 different values to whatever inserting into the orders table?