How to link several polysurfaces together in one big polysurface

Rhino Rhino for Mac
2

this is a follow up of the other topic ?

closed Polysurfaces can be combined together with
_BooleanUnion

there is also _BooleanDifference _BooleanSplit

After BooleanUnion, some reduction is possible with
_mergeAllCoPlanarFaces

kind regards -tom