Urgent : How to modify the line type and table type

I am working on ALV Grid Control, i need to know how to modify the line type values to table type.
             ls_celltab-fieldname = 'ZSAVINGS '.
             ls_celltab-style = l_mode.
        INSERT ls_celltab INTO TABLE pt_celltab.
Here ls_celltab is line type and pt_celltab is table type.
Please give me the suggestion ASAP.
C.Bharath Kumar

Hi,
Here is the example
DATA: BEGIN OF LINE,
        LAND(3)  TYPE C,
        NAME(10) TYPE C,
        AGE      TYPE I,
        WEIGHT   TYPE P DECIMALS 2,
      END OF LINE.
DATA ITAB LIKE SORTED TABLE OF LINE
          WITH NON-UNIQUE KEY LAND NAME AGE WEIGHT.
LINE-LAND = 'G'.   LINE-NAME   = 'Hans'.
LINE-AGE  = 20.    LINE-WEIGHT = '80.00'.
INSERT LINE INTO TABLE ITAB.
LINE-LAND = 'USA'. LINE-NAME   = 'Nancy'.
LINE-AGE  = 35.    LINE-WEIGHT = '45.00'.
INSERT LINE INTO TABLE ITAB.
Regards
Sudheer

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