i mightve not understood your question correctly..but once the host is joined into the dvswitch you can manage what dvuplink a vmnic is attached to by going to Configuration>Networking and clicking Manage Physical Adapters.
From there you can attach/detach vmnics to the dvUplink you need.
ps. Yes, I've found that if i add a host with 8 pnics to my dvS of 8 uplinks it will matchup the vmnics with dvuplinnks( ie vmnic0>dvuplink1, vmnic1>dvuplink2). And yes, its confusing that vmnics start at '0' and uplinks start at '1'