How to create a via from layer 1 to 3 on a 8 layer PCB?

I'm working on a design for a 8 layer PCB with Multisim/Ultiboard v10. In Multisim under sheet properties i selected the PCB to contain 8 layers, which makes Ultiboard to create this board with 4 layer pairs and 0 top/bottom build-ups. In the PCB properties of Ultiboard i enabled micro vias and buried/blind vias but i noticed that i'm not able to allow vias between some combinations of layers.
For example i can enable vias from top to the second layer (1st inner) and from top to the fourth layer (3rd inner), but not from top to the third layer (2nd inner).
When placing a via, i can select top for the start and the 3rd layer
for the end, but it will be created as via between top and the 4th
layer, which will -of course- shorten several traces on the 4th layer.
So my questions is: Why am i not allowed to create a via, that goes from the top layer to the third layer and how to enable all possible combinations of start and ending layers for the via?
Thanks for your help
fhn
PS: sorry for my bad english :/
Message Edited by fhn on 08-22-2008 04:39 AM

I am not 100% sure about this, but what I see happening here is that you can only select certain combinations of pairs. Once that selection is made it will gey out other selections as not valid. You might want to carefully look at the options in the via selection and make sure of which layers you want vias to be on. I don't know about enabling all layers in this selection. I would assume this would not be legal from a design rules standpoint, but since most of my boards are either single or double sided I do not have the necessary experience with multi-layers to give a proper answer to that.
This is the only thing I can advise as when I went through the process I was able tio select the vias for the layers you outlined in your post.
I hope this helps somewhat as this is all can tell you.
Kittmaster's Component Database
http://ni.kittmaster.com
Have a Nice Day

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