Pentaho: Update a record of database using public parameter

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Using Pentaho, I would like to update records of database with the value of some of public parameters of the transformation. I know that I can use the value of parameters in some steps such as Table input or Database Join by checking the Replace variable option. However, I cannot find any way to pass value of public parameters of the transformation in order to use in Update step. Can anyone help me with that?

For clarificattion: I want to use the parameter which is defined here Public parameters of transformation

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Rojin On BEST ANSWER

In order to use public parameter of transformation, Get Variable step can be used.