New symbol short net on different layer

Hi all, 

I would like to do a short between  two nets / plane on different layer.

The good solution could be a via, and use property "Net_short".

But I don't want to use the property "Net_short" and I have created a symbol  for to have more control on PCB.   

But it's not clear to me how I can do a vias in Allegro to connect two nets/plane both external and internal layer. 

I already tried some solutions but they don't work. 

Does anyone have any ideas?

Thanks