How to execute query to store the result in the target table column ?

Hi
Source: Oracle
Target: Oracle
ODI: 11g
I have an interface which loads the data from source table to target. Some of the columns in the target tables are automatically mapped with source table. Some of the column remain un-mapped. Those who remain un-mapped, I want to load the values in that column by executing an query. So can anybody tell me where I should mention that query whose result would become the value of the specific column.
-Thanks,
Shrinivas

Actually I select the column from the target table then in the Property Inspector-->Mapping properties-->Implementation
tab I have written the query which retrieve the value for that column. Is the right place to write the query? How can do this ?
-Shrinivas

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