Dynamically inserting new line in Internal table

Hi,
Can anyone help me how to insert a new line dynamically to the internal table.
Assume there are 5 records that has been added to ITAB.
In that if a particular field in that ITAB crosses the limit 10 then i have to split that line into two lines with the same data except that Par.field as 5 and the other record has 5.
In the third record that particular field has value 10.
Loop at ITAB.
Once i found that field has 10 then how to insert a new line dynamically over here to add another record.
endloop.

Hi..
Hi..
try this..
loop at itab.
if ( i found that field <f1> has 10 ).
    w_line2 = itab-f1+5(5).
    w_line3 = itab-f1.
***********First line********
    itab-f1 = itab-f1+0(5).
    modify itab index sy-tabix from itab transporting f1.
***********second line********    Hi..
try this..
loop at itab.
if ( i found that field <f1> has 10 ).
    w_line2 = itab-f1+5(5).
    w_line3 = itab-f1.
***********First line********
    itab-f1 = itab-f1+0(5).
    modify itab index sy-tabix from itab transporting f1.
***********second line********
    itab-f1 = w_line2.
    insert itab INDEX SY-TABIX.
**********third line**************
    itab-f1 = w_line3.
     insert itab INDEX SY-TABIX.
endloop.
    itab-f1 = w_line2.
    insert itab INDEX SY-TABIX.
**********third line**************
    itab-f1 = w_line3.
     insert itab INDEX SY-TABIX.
endloop.

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