How to convert the flat file in to complex structure in graphical mapping

Hi Friends,

could any one help me in achieving this complex structure, All the segments are 0-unbounded

Input structure is like this

RECORD(0-unbounded)

  Segment 1

  Field 1,Field 2,Field 3

  Segment 2

  Field 1,Field 2,Field 3

  Segment 3

  Field 1,Field 2,Field 3

  Segment 4

  Field 1,Field 2,Field 3

  Segment 5

  Field 1,Field 2,Field 3

  Segment 6

  Field 1,Field 2,Field 3

  Segment 7

  Field 1,Field 2,Field 3

   Segment 8

  Field 1,Field 2,Field 3

Output structure:

RECORD

     Segment 1

               Field 1,Field 2,Field 3

     Segment 2

               Field 1,Field 2,Field 3

     Segment A

           Segment 3

                    Field 1,Field 2,Field 3

           Segment 4

                   Field 1,Field 2,Field 3

           Segment 5

                   Field 1,Field 2,Field 3

           Segment B

                 Segment 6

                         Field 1,Field 2,Field 3

                 Segment 7

                         Field 1,Field 2,Field 3

    Segment 8

          Field 1,Field 2,Field 3

I have an multiple records in input file

for sample input files see the attachment.

Thanks in Advance.