Assign IP address to ng interface without destination address

Is it possible to assign an IP address to the ng interfaces without destination address? Is it possible to assign the destination address later?
 
I suppose my question is quite obvious. This is how we should assign an IP address to the ng interface:
[cmd=]ifconfig ng0 w.x.y.z a.b.c.d [/cmd]
The first IP address and the second IP address (destination address) must be assigned together. Now, I wonder if it is possible to assign the second IP address separately?
 
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