How to filter rows that comes from another step

Hi everyone,
I would like to know how to filter rows that the data come from Table input step.
I have a Table input step that contain a query with union all statement, the query result have column1, column2. So i want to get a max() of column2. That the result of this transformation is the column2 with max() data.
I tried several ways to do it, but I couldn't.

Any help, will be appreciated.

rgs
Dimy