OpenTunnel Designer Help OpenTunnel Designer Workflows Drawing Workflow Annotate Detailing Placing Detailing SymbolsPlacing a Section CalloutTo Open a Section View from a Callout in the Same View Window To Open a Section View from a Callout in the Same View Window With the sheet open, hold the pointer on the section callout. Select Open Design Model from the Mini toolbar. The section view opens in the same view window.