ADS Via Configuration

Hello guys. I need some help with the via configuration dialog box in ADS.

First of all, check my layer stackup out:-

FreeSpace (open boundary)
RO4350b
PrePreg
FR4
Air (open boundary)

And here is some detail of the metallization:-

FreeSpace
-------- -STRIP-RouteLayer1
RO4350b |VIA| diel2
-------- -SLOT-cond2
PrePreg |VIA| diel
-------- -SLOT-cond3
FR4 |VIA| diel3
-------- -STRIP-RouteLayer2
Air

Please see if I'm going at it the right way. The board is a 4 layer board with RouteLayer1 and RouteLayer2 as RF and control signal routing layers respectively. Whereas, cond2 and cond3 are GND and Power planes.

Now, I want to be able to connect vias from RouteLayer1 and RouteLayer2 to all metallization layers. I'm getting stuck at the Via Configuration dialog box (Options>Via Configuration...).
I cant seem to be able to add any via to the list. Please help me out here.

Also, as a corollary, I need a solution to connect a STRIP and a SLOT layer.

Thanks and regards.