You can't, because that makes no sense. Consider what you're modeling physically - what is that connection? How could you have a connection that displaces (restricts) a particular DOF in one condition, but allows that same DOF to be free in another condition?
For example, consider a U-bolt which provides restraint in Y and Z (assume the pipe is running in X. Now if this location is displaced in Y and Z this could be defined as:
DX = blank, free
DY = dy
DZ = dz
RX = blank, free
RY = blank, free
RZ = blank, free
Now, if the displacements were considered separately:
DX1 = blank, free
DY1 = dy
DZ1 = blank , NOT FREE because DZ2 is specified
RX1 = blank, free
RY1 = blank, free
RZ1 = blank, free
DX2 = blank, free
DY2 = blank, NOT FREE because DY1 is specified
DZ2 = dz
RX2 = blank, free
RY2 = blank, free
RZ2 = blank, free
Think about it, you still have the U-bolt, even if you only displace it in DY, the DZ DOF is still not free.
The same discussion can be applied to a nozzle - all 6 DOFs are restrained. You can't have a DOF restrained/displaced in one condition and free in another.
_________________________
Regards,
Richard Ay - Consultant