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You probably want to Join or Union your data. If you haven't watched the Interactive Lessons in the Academy, I would strongly recommend starting there as they will answer many questions you will have starting out.
You could use a Union tool if you're bringing each of the 4 txt files in from individual Input tools.
If your TXT files all have he same table structure (schema), you could also use wildcards in an Input tool to read them all files that match the search criteria. Help document linked for the tool explains how wildcards can be used.