Replace Area/SWC with an imported Outline
At the moment you can replace areas with Free Form outlines. It would be good if there could be an ability to add additional points or replace with an imported outline

Thank you for the suggestion and thanks to those who commented and voted.
I am pleased to advise that we've successfully implemented this feature in our latest drainage design software (InfoDrainage), please try importing a polygon (shape file, CAD file or CSV) and InfoDrainage will be able to recognise it as SWC, you can then choose which SWC do you want to see.
In 2023.3 (which was released on the 2nd Feb 2023), we improved this by enabling users to import polygons with arcs.
Please have a go and let us know how you get on.