"If" Condition in ODI

Hi,
I'm new to ODI. I want to implement the "if" condition in ODI. Can we do it using variables? If yes, how can we implement it?
Variable 1 = my condition is "if source_column1 > 0 Then 1 Else 0"...
Variable 2 = If variable1=0 then <action1> else <action-2>
After calculation, I need to assign these variables to the target column.
Please help.Thanks.

Thanks a lot SH and Yellanki.
But I need to apply 4 business rules in the single column. For example, let the source column "src_column_q1". Each step got its own arithmetic operations and it's given as <temp_value>.
ie, Check src_column_q1 > 0 then 1 else 99
If <step1>=99 then <temp_value2.1> else <temp_value2.2>
If <step3>=<temp_value2.1> then <temp_value3.1> else <temp_value3.2>
If <step4>=<temp_value3.1> then <temp_value4.1> else <temp_value4.2>
In the target column (trgt_column_q1), we need to give temp_value 4.1.
Appreciate your help.

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Hi Santos,
Is it possible to use the same in OpenTool as I am invoking these steps one by one using invocation API.
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