Generate two lines in listbox when select a specific item of combobox.

[coutinhoicaro]

Hi, i want to generate a mutiple line listbox

at first i have 3 optionbutton selection that as i select one it gave me some diferent values at the first combo box selection.

as example:

optionbox(NORMAL) --> combobox(ppm) --> Textbox(1,5)
optionbox(x) --> combobox(ppm) --> Textbox(1,2)
optionbox(EXCEPCIONAL) --> combobox(ppm) --> textbox(1,1)

each one of the selection is placed at a listbox line after i press a button

but i want when i select a combo box with VALL it generate 4 lines for me as:

optionbox(NORMAL) --> combobox(vall) --> Textbox(1,5) then

NORMAL / VX+ / 1,5
NORMAL / VX- / 1,5
NORMAL / VY+ / 1,5
NORMAL / VY- / 1,5

if i select an specfied item (VALL) it generate a list box whit 4 diferente items as ( vx+,vx-,vy+,vy-), but the same value of the others combo selected.