Is it correct that you can’t use bbox more than twice when adding to secondary groups?

I’ve looked at this post concerning secondary groups in sofimsha which, somewhat, has the functionality i’m looking for, but sofimshc seems to be lacking the ability to add multiple groups together?

Please see excerpt below.

```
+prog aqua urs:19.1
head materials
NORM DC EN 199X-200X G 9.81
CONC NO 11 C '40' FC 40 EC 35000 GAM 25
end
+prog sofimshc urs:19.2
head Geometry
SYST 3D GDIV 100000 GDIR NEGZ
CTRL MESH 1
unit 6
loop#i 4
SPT 11+#i*10 X 0+#i*1000 Y 0 Z 0
SPT 12+#i*10 X 0+#i*1000 Y 1000 Z 0
endloop
loop#i 3
SAR 1+#i MNO 11 t 100
SARB NA 11+#i*10 NE 12+#i*10
SARB NA 12+#i*10 NE 22+#i*10
SARB NA 22+#i*10 NE 21+#i*10
SARB NA 21+#i*10 NE 11+#i*10
endloop
GRP 'GR1'
BBOX xmin 0 xmax 3000 ymin 750 ymax 1000
BBOX xmin 0 xmax 3000 ymin 0 ymax 250
END
```