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In general it is organised, as a huge tree, with the indentation below, showing different levels down that tree:

• centre (BoM, ECMWF, NCEP, JMA, ...)
  • realtime or reforecast
    •  type of data (control forecast or perturbed forecast)
      • type of level (single level or pressure level or potential  temperature)
        • model version date (20142015-0112-01 03 or ...)
          
          • hindcast dates (20132014-0912-0103, 2013-0912-0603, 20132012-0912-1103, 20132011-0912-1603,  20132010-0912-2103, 20132009-0912-2603, ...)
            •  time and steps
              • members (for perturbed forecast)
                • levels (for pl or pt)
                  • parameters

• The objective of this example is to demonstrate how to iterate get efficiently over all the available hincastDates for an ECMWF model version date.
• To start writing your request you firstly need to select a model version date and to find the corresponding Hindcast Dates. Please  check ECMWF availability
  Keep in mind that the ECMWF reforecast configuration is "on the fly". For more information read a brief description of reforecasts.
• The requests below can be used as a starting point, however you need to keep in mind that you have to adapt it to your needseg to set the keyword values according to your requirements ("param", "levtype", "step" etc).
• In this way you can extend this request example to download the whole S2S ECMWF reforecast. Don't forget to check ECMWF availability

You can use the variable target to organise the requested data in files as you wish.