This is the dialog where you define your niches.

The niche geometry must be defined beforehand as niche types from the Profiles pull-down menu in the Define Tunnel Profile Geometry dialog. The niches are defined in groups (typically are all niches of the same type/purpose defined in the same niche group). In this dialog, you define one group of niches. A niche group can consist of one to many niches. You must specify a name for the niche group.

Each niche instance is defined by a chainage number, the niche type, and the location (left or right).

• OK to save the data from this dialog to the tunnel model shown in the Define Tunnel Profile Geometry dialog and close the dialog.
• Apply to just save the data from this dialog to the tunnel model without closing the dialog.
• Close to shut down this dialog without saving the data.