Modify the structure of internal table which created dynamically!!!

HI All,
I am creating internal table dynamically using the below syntax. Now I need to remove few of the fields from the internal table structure. Could you please help me how to go ahead in these cases?
* Create table dynamically for local data
CREATE DATA gv_table_l TYPE TABLE OF (<fs_tabname>).
CREATE DATA gv_wa_l TYPE (<fs_tabname>).
ASSIGN gv_table_l->* TO <fs_local_tab>.
ASSIGN gv_wa_l->* TO <fs_local_wa
>.
Please let me know if you have any thoughts.
Thanks,
Raghu.

Hi ,
check this wiki
[Internal Table|http://wiki.sdn.sap.com/wiki/display/Snippets/Howtocreateinternaltable+dynamically]
in your case ...
1.Get filed list based on the type ...make use of "cl_abap_datadescr=>describe_by_type('MARA'), check for syntax or sample programs...
2.Delete fields which you dont want to be in your internal table....
3.Create internal table using method " CL_ALV_TABLE_CREATE=>CREATE_DYNAMIC_TABLE" ref attached link for sample code by Pinaki...
regards
Prabhu

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The requirement code :
types: begin of t_data,
 form like zscr_data_hdr-form,
 werks like zscr_data_hdr-werks,
 matnr like zscr_data_hdr-matnr,
 verid like zscr_data_hdr-verid,
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 fld4 like zscr_defect_data-defect_val,
 fld5 like zscr_defect_data-defect_val,
 fld6 like zscr_defect_data-defect_val,
 fld7 like zscr_defect_data-defect_val,
 fld8 like zscr_defect_data-defect_val,
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 fld26 like zscr_defect_data-defect_val,
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 fld34 like zscr_defect_data-defect_val,
 fld35 like zscr_defect_data-defect_val,
 fld36 like zscr_defect_data-defect_val,
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 fld38 like zscr_defect_data-defect_val,
 fld39 like zscr_defect_data-defect_val,
 fld40 like zscr_defect_data-defect_val,
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 fld42 like zscr_defect_data-defect_val,
 fld43 like zscr_defect_data-defect_val,
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 fld45 like zscr_defect_data-defect_val,
 fld46 like zscr_defect_data-defect_val,
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 fld48 like zscr_defect_data-defect_val,
 fld49 like zscr_defect_data-defect_val,
 fld50 like zscr_defect_data-defect_val,
 fld51 like zscr_defect_data-defect_val,
 fld52 like zscr_defect_data-defect_val,
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 fld54 like zscr_defect_data-defect_val,
 fld55 like zscr_defect_data-defect_val,
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 fld57 like zscr_defect_data-defect_val,
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 fld60 like zscr_defect_data-defect_val,
 fld61 like zscr_defect_data-defect_val,
 fld62 like zscr_defect_data-defect_val,
 fld63 like zscr_defect_data-defect_val,
 fld64 like zscr_defect_data-defect_val,
 fld65 like zscr_defect_data-defect_val,
 fld66 like zscr_defect_data-defect_val,
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 fld72 like zscr_defect_data-defect_val,
 fld73 like zscr_defect_data-defect_val,
 fld74 like zscr_defect_data-defect_val,
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 fld76 like zscr_defect_data-defect_val,
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Some times fld1 to fid170 or more fields will be there in my internal table.
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Hi
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form like zscr_data_hdr-form,
werks like zscr_data_hdr-werks,
matnr like zscr_data_hdr-matnr,
verid like zscr_data_hdr-verid,
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fieldxx type string,
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Modify the structure of internal table which created dynamically!!!

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