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DegreeShift can be used explicitely.
See Oaku-Takayama, JSC 32 (2001), 575--595 and
    Granger-Oaku, Minimal filtered free resolutions ...
Example.
  [(x,y) ring_of_differential_operators
   [[(x) -1 (Dx) 1]] weight_vector
   0
   [(degreeShift) [1 0 2 0 0 3]]
  ] define_ring

% $OpenXM: OpenXM/src/kan96xx/Doc/test-shift.sm1,v 1.1 2003/06/26 08:14:45 takayama Exp $

(testing degree shift) message

[(t,x,y) ring_of_differential_operators 
  [[(Dt) 1 (t) -1]] weight_vector
  0
 [(degreeShift) [1 0 (1).. 0 0]]
] define_ring


/foo {
  [[(0). (-2 Dx). (2 t). (y). (x^2).]
   [(3 t). (-3 Dy). (0). (-x). (-y).]
   [(Dx). (0). (-Dy). (Dt). (0).]
   [(-3 x^2). (0). (-2 y). (1). (0).]
   [(3 y). (6 Dt). (2 x). (0). (1).]] /ff set

  ff fromVectors /ff set ;
  [ff homogenize [(needSyz)]] groebner /gg set 
  gg pmat ;
} def


(Type in foo) message