When the Cable Tray tool is selected, the Modify | Place Cable Tray tab provides options for placing cable tray.
Create Riser: lets you create a vertical cable tray while working in the editor. Pick a start point and elevation, choose a new elevation in the Properties palette, then click Create Riser. You can also use it while laying out cable tray by changing the elevation and clicking Create Riser to add a vertical segment.
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Automatically Connect: lets you automatically connect to the snaps on a component when starting or ending a cable tray segment. This option is useful for connecting segments at different elevations. However, when drawing cable tray along the same path as another cable tray at a different offset, clear Automatically Connect to avoid making an unintentional connection.
Inherit Elevation: inherits the elevation of the element being snapped to.
Inherit Size: inherits the size of the element being snapped to.
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Tag on Placement: Applies the default annotation tag to a cable tray segment when it is placed in the view.