Track point on the shortcut menu and place a track point. You can use 
Delete track points to delete all track points and start again.Track lines facilitate the intuitive design process and can save a lot of time and effort as you can bypass the process of drawing construction lines. All you need to do is point to existing elements and this new feature sums up a maximum of five track points. Symbols are assigned to these ‘collected’ track points, which define the type of track lines displayed.
Instead of pointing to an element and waiting until the program automatically activates track tracing, you can also click Track point on the shortcut menu and place a track point. You can use Delete track points to delete all track points and start again.
Tip: Track points snapped are marked by rectangles appearing around the track point or point snap symbol.
Available track points and track lines
Extension
After activating a design tool, point to the start/end point of an element. When you move the crosshairs along the extension of the element, the program displays a track line stretching from this element. In the case of two track lines, you can also use the virtual points of intersection between these two lines.
Orthogonal track lines
After activating a design tool, move the preview of the element roughly in the direction of the X or Y axis. The nearest horizontal or vertical track line is displayed.
Polar track lines
Orthogonal track lines are complemented by polar track lines. After activating a design tool, position the preview of the element roughly at the cursor snap angle set for polar track lines. The nearest track line matching this angle is displayed.
Perpendicular
After activating a design tool, point to an existing element roughly where the perpendicular is to be dropped. Wait until the program displays the appropriate symbol. When you move the crosshairs along the extension of the perpendicular, a track line appears. You can now click a point on the element or track line or enter the length of the perpendicular in the dialog line.
Parallel line
After activating a design tool, move the crosshairs to a linear element and position the cursor somewhere between the element's midpoint and end point. Wait until the program activates the track tracing feature (you can define a time limit in the Point Entry Options, Track Tracing tab) and shows the appropriate symbol; in other words, the program displays a parallel track line. Now you can click a point on the track line or enter the length of the element in the dialog line.
Assumed point of intersection
After activating a design tool, point to the start/end points of existing elements one after the other. When you move the cursor near the assumed point of intersection, the program displays the extensions of the ”collected” elements and the assumed point of intersection.
Note: You can also use track tracing in conjunction with 3D solids. The following illustration shows a truncated cone whose edges are extended to the virtual vertex.
Entering length values when working with track lines
Entering length values using the preview
When you move the preview of an element along a track line, the current length of the element is displayed. This length is a multiple of the value specified for 
Rasterize length in the dialog line (even when Rasterize length is not active). If Rasterize length is active, the Basic dimensions, Outside dimensions - and Opening dimensions + settings also have an effect on the length displayed.
Entering numerical length values in dialog line
Offset to reference point (starting point of element) and 
Offset length (track line). Adjusting the options
You can make settings for track tracing in the 
Options, Desktop environment, Track tracing.
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