Convert workarea to CHAR?

Hi,

Is there an FM to convert workare into CHAR?

LOOP AT it_table into wa_table
  
  Convert wa_table to char. ???????????????????????????

  CONCATENATE 
  wa_field1
  wa_field2
  wa_field3
  ets.............................
  into h_row
  SEPERATED BY ';'
 
  APPEND h_row TO it_billit_down.
 
ENDLOOP.

PERFORM GUI_DOWNLOAD.

Adibo..:)