*SBXY
r1, r2, r3, r4
r1: r*8: x1-extension
r2: r*8: x2-extension
r3: r*8: y1-extension
r4: r*8: y2-extension
This card is used in conjunction with *AUTM, or *STLF to define an extension of the substrate beyond the bounding box of the part. The following figure illustrates the option.
Assigning substrate geometry using *SBXY