internal table manipulation

Hi

i like to know that, an internal table is having five fields like

data: begin of itab1 occurs 100,

field1 type c,

field2 type c,

field3 type c,

field4 type c,

field5 type c,

end of itab1.

for every loop paas of an internal table itab2 the data should

be assigned to the next field of itab1.

after 5 iterations the data should get appended to itab1.

how to do this. can anybody help me.

points will be rewarded.