Add a pipeline to read the source file
Version:
You must implement a pipeline that reads data from the text file, iterates the data, and passes the data to the pipeline that handles a single row of data.
To add a pipeline to read the source file:
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In the Content Editor, navigate to /sitecore/System/Data Exchange/File System Provider Test Tenant/Pipelines.

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In the right-hand pane, click Pipeline. Name the new item Read City Info from File Pipeline.
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Drag and drop the new item to the first position in the Pipelines folder.

Note
The order of the pipelines in the folder is not important. However, when a pipeline calls another pipeline, it is helpful to place the pipeline that calls the other pipeline before the pipeline it calls.