https://communities.bentley.com/products/building/performance/f/hevacomp-forum/136500/modelling-a-zone-room-within-a-zone-roomI have just received the latest Technical Bulletin for Stroma. In it they refer to Convention 4.08 - Modelling a zone within a zone. The example of a small office block within a larger warehouse type zone is given, where the smaller zone has no usefulen-USTelligent Community 12https://communities.bentley.com/thread/413042?ContentTypeID=1Thu, 18 May 2017 14:37:39 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:35fe76bc-f1ca-4ddb-b24c-3970d02f86a9Shane Regan<p>Hi Stuart,</p> <p>Modelling of such spaces can only be directly achieved in Hevacomp Simulator by using Atrium key words. However if you wish to use Design Database for level 3/4 Part L calcs then there are three workaround options available - please see further details <a title="Wiki" href="/products/building/performance/w/building_performance__wiki/10226.cad-model-design-adding-atrium-style-spaces-to-a-project">here.</a></p> <p>Should you wish to manually edit surface areas then you could use method three -&nbsp;converting to Room Data mode.However please ensure to backup your project&nbsp;before doing so, as detailed <a title="Wiki" href="/products/building/performance/w/building_performance__wiki/12071.cad-mode-and-room-data-mode">here.</a></p> <p>This should give you what you need. Please let me know if you have any questions.</p> <p></p><div style="clear:both;"></div>