Not everything on a site plan is a building or a parcel. A massing study, a setback line, or a reference marker still needs a shape with no usage applied, and that's what the shapes picker is for.
Select the Generic Shape tool from the Drawing toolbar. Click the down arrow to select a shape to draw.
Point
Click once to place the point.
Circle
Click to place the center.
Click again to set the radius, or type a number instead of clicking to set an exact radius.
Line
Click to place the first point.
Click again to place the second point and finish. A line is limited to exactly two points.
Unlike every other shape on this page, a Line doesn't snap to the grid with Shift or take a typed distance. Both need a previous segment to measure from, and a Line only ever has the one.
For an open line with any number of points, use the standalone Polyline Tool instead.
Curve
A line with a radius rounding off its corners.
Click to place each point.
Finish by pressing
SpaceorEnter, or by double-clicking your last point once you've placed at least 3 points.
After your first point, hold Shift while placing the next point to snap it to the grid or to a right angle from your last segment. Type a number instead of clicking to set that segment's exact length.
The corner radius doesn't get set while drawing. It starts at a default of 10 once you finish, then you adjust it in the properties palette: a Corner Radius number, and a Corner Type choice between fillet (rounded) and chamfer (beveled). One radius applies to every corner.
Spline
A smooth curve running through your clicked points (a Catmull-Rom spline).
Click to place each point.
Finish by pressing
SpaceorEnter, or by double-clicking your last point once you've placed at least 3 points.
After your first point, hold Shift while placing the next point to snap it to the grid or to a right angle from your last segment. Type a number instead of clicking to set that segment's exact length.
Adjust how tightly the curve follows your points with the Smoothness property afterward, from 0 to 1 (default 0.5).
Patch
Draw a patch to make a 3D polygon. Each point of a patch can have its own height, so the surface can slope like a roof plane, a ramp, or a landform. Press P then A to start drawing a patch.
Click to place each point.
Close the shape by clicking your first point, by double-clicking your last point once you've placed at least 3 points, or by pressing
SpaceorEnteronce you've placed at least 4 points.
After your first point, hold Shift while placing the next point to snap it to the grid or to a right angle from your last segment. Type a number instead of clicking to set that segment's exact length.
Every point starts flat, at a height of 0, and the patch starts in slab mode. In the properties palette, switch Patch Mode to wedge to taper it back to the base instead, and set each point's height individually in Patch Offsets, listed as V1, V2, and so on. Hover a row to highlight that point on the map.
A patch sets a height only at the points you draw around its edge, so it has no single peak in the middle. To make a pointed pyramid, pick Pyramid from the shapes picker and set its width, height, and depth in the properties palette.