You can construct a line through the current origin, normal to the current workplane. (Input features do not need to be provided.)
To construct an alignment line:
Open the Construct Line dialog box (Insert | Feature | Constructed | Line).
From the Method list, select the Alignment option.
Do not select any features.
If you want to change the feature theoretical values, select the Feature theoreticals check box and type in the values. For details, see the "Specifying Feature Theoreticals" topic in the PC-DMIS Core documentation.
Click the Create button.
The Edit window command line for this option would read:
CONSTR/LINE,ALIGN,length
A - Line through the current
origin normal to the current workplane
B - Current workplane
C - Origin
Constructing a Line Normal to the Workplane