geometry_line movement

Hello everybody!

Need help: I need to move a geometry_line that has initial boundary
(bounda_dof 1 -geometry_line -velx) in such way that e.g. its one point
moves with 0.1 velocity and another with 0.01 velocity in x-direction.
I know if i prescribe something like:
bounda_time 2 0.0 0.0 1.0 0.05 1.e5 0.05
then all points of the line will move with similar velocity, but how i can
set the different velocity for the points of the geometry_ line? 
Thanks!


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