Relationship for portal based on valuelist

Hi

My question is...

Is it possible to ha a valuelist to decide which relationship to be used
in a portal?

f.ex

When I select "A" from a valuelist. I want to use relationship "1" in
the portal. When I select "B" from
the same valuelist I want relationship "2" to be used for the same
portal, and so on.


A.J.