Modify Z position
There are two methods to change the Z position:
Defines an absolute Z value; if multiple points are selected, Set Z Values assigns the same Z value to each point. 
Moves the position of a point up or down a given value relative to the current Z position (identified using the Z meter). 
This is how you calculate the shift: shift = desired Z - current Z
If the shift value is negative, the Z position moves down.
If the shift value is positive, the Z position moves up.
Example: If desired Z=-30 and current Z=-10 then shift = -30 - (-10) = -20
The Z position of the selection moves down by 20 micrometers.
Procedure for "Shift Z values"
- Click Trace>Edit>Select objects.
- Click an object to select it. The object is represented by a series of points (displayed as small squares).
- Place your cursor over a point to view its coordinates. In the example, X,Y,Z are -803.42, 477.80,-3.76:
- Determine the desired Z position and calculate the value for the shift from current Z position to desired Z position:
shift = desired Z - current Z
- Click the point to select it, right-click and select Shift Z values. Enter the value from step 4.
For multiple points
To change the Z position for multiple points simultaneously, you need to identify the point to use to determine the shift value (i.e., how much you'll need to shift all the points).
- Click Trace>Edit>Select objects.
- Click an object to select it. The object is represented by a series of points (displayed as small squares).
- In Ortho View, visualize the points in Z and identify the most suitable point.
- In the tracing window, hover over that point to view its XYZ coordinates.
- Determine the desired Z position for that point and calculate the shift value (i.e., negative or positive value of the distance between current Z and desired Z).
- Select all the points that require a new Z position.
- Right-click and select Shift Z values. Enter the shift value.
