How to load the value in target 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

You can put the query (or subquery) into the mapping field.
You can also call a function in the mapping field which may be easier in your case.

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