When you save a sections library in text format the data is formatted according to the following procedure-

Number of groups in the file

 For each group

  1 if the group is locked or 0 otherwise

  Name of the group

  Number of the group in the library

  Kind of material 1 for steel, 2 for concrete, 3 for timber,

    4 for aluminium, 0 otherwise

  Shape of sections in the group I=1, Channel=2, Equal

    Angle=3, Unequal Angle =4, Tee=5, Rectangular Tube =6,

    Square Tube (SHS)=7, Circular Tube=8, Circular bar=9,

    Rectangular bar=10 , Folded Cee=11, Folded Zed=12

  No of sections, no of fields and no of analysis properties in the group

  Position of the analysis properties in the fields of the group

  For the number of fields
    Name of the field

  For the number of fields
    Units of the field

  For the number of fields
    Factor of the field

  For the number of sections

    Name of the section

    For the number of fields
      Value of the field for this section

 For each material

  Name of the group

  Number of the group in the library

  Kind of material 1 for steel, 2 for concrete, 3 for timber,

    4 for aluminium, 0 otherwise

  Density of the material

  Thermal Coefficient of the material

  Poisson’s Ratio of the material

  Young’s Modulus of the material

  Shear Modulus of the material

  Yield Stress of the material

  Ultimate Stress of the material

The easiest way to understand the format is to use the Export command to save a text file from a sample library and to review or modify that text file.