The options available are:

• New span:
  Subdivide the wall into sections, indicating the height of each span and its thickness. The reinforcement is divided in each span.
• Edit span/foundation:
  Allows users to modify the characteristics of the wall or foundation.
• Delete span:
  Deletes the selected span.
• Generate spans:
  Can be used to generate steps or to indicate the vertical reinforcement spans. This is recommended for very high walls or walls of constant thickness.