How to prepare excels based on records of internal table.

Hi abapers,
I have a scenario as follows:
In my internal table the records are as follows.
col1   col2        col3
1        a1          b1
2        a2          b1
3        a3          b2
4        a4          b3.
Now want i need is i have to break the records on the basis of col3 . All b1 rows are to be taken and dumped in a excel. b2 rows are to be taken and dumped in an excel and similarly for b3. And the name of excel will should be b1, b2 , b3 respectively.
How do i go for the case?
Help would be appreciated..
Regards,
Navin C
Edited by: navin.c on Jun 12, 2009 7:41 AM

put col3 as the first field in your itab.
TYPES:BEGIN OF ty3,
col3(3) TYPE c,
col2(3) TYPE c,
col1(3) TYPE c,
END OF ty3.
DATA:itab3 TYPE TABLE OF ty3.
DATA:it_xl TYPE TABLE OF ty3.
DATA:wa3 TYPE ty3.
DATA:file_name TYPE string.
SORT itab3 BY col3.
LOOP AT itab3 INTO wa3.
APPEND wa3 TO it_xl.
AT END OF col3.
    READ TABLE itab3 INTO wa3 INDEX sy-tabix.
    CHECK sy-subrc = 0.
    file_name = wa3-col3.
    PERFORM download_xl USING file_name.
    REFRESH it_xl.
ENDAT.
ENDLOOP.
*&      Form download_xl
*       text
*      -->P_FILE     text
FORM download_xl USING p_file type any.
DATA:lv_path TYPE string VALUE 'c:\'.
CONCATENATE lv_path p_file '.xls' INTO p_file.
CONDENSE p_file NO-GAPS.
CALL FUNCTION 'GUI_DOWNLOAD'
    EXPORTING
      filename              = p_file
      filetype              = 'DAT'
      write_field_separator = '#'
    TABLES
      data_tab              = it_xl.
ENDFORM.                    "download_xl

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