Use of expression

Dear all,
I have written a expression in expression oprator. the expression i have written i want to use it for other calculation as well in the same expression oprator. to reuse with some more formula i want to use variable which is there in expression Oprator in OWB11gr2.
if i declare some thing as a variable then how can i use it in other calculation as i can't get the reference of variable.
Any help.
eg
variable name com_cal
formula
DECODE( EXP_NRT.USER_DETAIL_FLAG ,'U', EXP_NRT.TRANSACTION_END_TIME
- NUMTODSINTERVAL( (EXP_NRT.RESPONSE_TIME + NVL(NVL( EXP_NRT.AVG_NRT , EXP_NRT.DEFAULT_NRT ),0) * EXP_NRT.NRT_COMMON -
nvl( EXP_NRT.LOCAL_SERVICE_EXCLUDED ,0) - (nvl( EXP_NRT.LOCAL_SERVICE_UNKNOWN ,0) * EXP_NRT.UNKNOWN_LOCAL_TIME ) -
nvl( EXP_NRT.EXTERNAL_SERVICE_TIME ,0) - nvl( EXP_NRT.WAIT_TIME ,0) - nvl( EXP_NRT.SPINE_TIME ,0))
,'SECOND'),NULL)
now i want use the output of the above as input in other column so that i can extract the timepart from the above.
if i declare the above as vaable then i don't know how to refer the variable in calculation as it doesn't appear in the column list in expression operator

Hi allan,
I know this the the only way, but in OWB11g2 you have variable feature in expression operator and there is no document on how to use that. Do you know how it can be used. if i declare something as a variable then how can i refer that variable in expression .
Thanks
Rajesh

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