Bounded and Unbounded Lines
By default, a Measured Line is created as bounded (BND form of the FEAT/LINE statement). You can define it as unbounded (UNBND form of the FEAT/LINE statement) by using the Specify Unbnd option in the PTS AND PATH menu (this option appears for Measure Line steps only).
When you select Specify Unbnd, the LINE BND/UNB menu appears with the following options:
Specify—Select the direction in which the line is unbounded, by using Flip and Okay options.
Remove—Lets you revert to the bounded form of line output. Available only if the line is currently defined as unbounded.