Provide a demolition layer system for DM HVAC
Provide a 'demolition' layer system option in addition to the 'new' & 'existing' layer options.
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Ryan
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You can add new layer systems using the DM HVAC→Customization→Layers commands. See this support post for how to make dashed ductwork. It requires a few extra steps because of how we do hidden lines.
http://www.designmaster.biz/support/blog/2010/01/how-to-make-dashed-ductwork/