Listbox into table

Question

hi
i have two tables one is original and another one is duptable
the two tables contain same fields like code,name,model etc.....,
so in the web form i have listbox
In the listbox,i have the code item which is reteived from one textbox
so i have to save this code from listbox into dubtable based on the original table code and its another fields
also i have to save code with name, model also in the duptable

can anyone give solution for this

regards vijay