To assign multiple padstacks to pins in cell editor:
Use shift key and keep it pressed, select first pin, then last pin, they will all be highlighted, with shift key still pressed, select padstack to be used.
you have the pins that you want to change select with the CTRL key. Then simultaneously press CTRL-SHIFT and select with the left mouse button to changed Padstack. Now you can select a different, but always hold CTRL-SHIFT-key.
I hope it helps, Best regards
Thanks for your answers, and it works too!. Amazing.