TINs can be edited several ways. The selection and editing tools apply only to the active TIN. If you are going to edit vertices, you must first turn off the TINs | Lock All Vertices menu command.
TIN vertices can be inserted, moved, deleted, or snapped to an existing TIN.
The triangles of a TIN can also be edited. Triangles can be individually deleted and created. Poorly shaped boundary triangles can automatically be selected to be deleted. Also, the density of existing triangles in a TIN can be increased using the Uniformly Subdivide TIN command.
Breaklines may also be introduced to edit the active TIN.
Related Links:
TIN Module