All colours used by the system can be configured via the Utilities/Configure/Colours command.
This allows you to assign different colours to different object and feature types.
You can also assign different colours to colour numbers. The colour number is an attribute which can be set individually for each object via the Computations/Attribute commands.
You can choose to display objects according to their object type colour, or according to their individual attribute colour number. This is done by toggling the Utilities/Display/Features check box "Use Colour Number".
Note that in long and cross section views, objects are always displayed according to their colour number.
Refer to the following Help Topics for detailed information:
Utilities/Configure/Colours - This command is used to set all colours.
Utilities/Display/Features ("Use Colour Number" check box) - This check box toggles whether objects are displayed according to their colour number, or the object type colour.
These commands are used to set the colour number attribute.
Computations/Edit/View-Edit Point
These commands are used to change the colour number attribute of objects.