Insert specific line in an internal table at a specific place

Question

Hi
i have an internal table (itab) let's say
Name1 Name2 NUM1 NUM2 NUM3
Which already populater with data.
i have to do a subtotal for every NAME1 and insert a line just after the NAME1 in the internal table
and another subtotal by every NAME1 NAME2 and insert a line just after every NAME1 and NAME2 in the internal table
then another Grand total at the end of the table
My psudeo code is a bit like that but the insert is done in the wrong row
Index=1
LOOP at itab index
if itab-name1 NE old
  insert structure in itab index
elseif itab-name1 NE old and itab-name2 NE old
  insert structure in itab index
elseif itab EQ last line
  insert structure in itab index
else
  structure-num1 = structure-num1 + itab-num1
  structure-num2 = structure-num2 + itab-num2
endif
index = index + 1
endloop
Do you think i need to use a temporary table here. can u guide me in code plz..

Answer 1

sort internal table by name1 and name2. <b>Have name1 and name2 as the first two variables in the internal table</b>
declare a work area and an internal table with the same structure as internal table.
declare num1 as type itab-num1.
num2 and i_num2 type itab-num2.
sort itab by name1 and name2.
loop the internal itab1.
append itab1 to itab2.
wa-num1 = structure-num1 + itab-num1
wa-num2 = structure-num2 + itab-num2.
i_num2 = i_num2 + itab-num2.
num1 = num1 + itab-num1.
num2 = num2 + itab-num2.
at end of name2.
append wa to itab2.
clear wa_name2.
endat.
at end of name1.
wa-num2 = i_num2.
append wa to itab2.
clear: i_num2, wa.
endat.
at last.
wa-num1 = num1.
wa-num2 = num2.
append wa_itab2.
endat.
endloop.
Thanks.