The ergonomic interface of archicad is to purify tools and functions. so I think it is possible to simply solve your request via a simple free bay (from a window or a door)
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Christophe - FRANCE Formateur Archicad indépendant à NANTES Archicad 15 to 29 FRA FULL
No, maybe I haven't used the correct word. What I'm searching for is a Water Interceptor. Its similar to a box placed in the earth where sewage or rain water pipes flow from different directions and then overflow to a main pipe.