Trim Elements to Roof or Shell

The Trim to Roof/Shell command allows you to connect Roofs or Shells with each other or with other model elements in any ARCHICAD model window. The result is a more complex structure whose elements are trimmed precisely to each other, although they remain separate elements.
Roofs and Shells trimmed to each other act as a single body when trimming other model elements.
Elements trimmed to each other are associative: a change to any element will immediately affect all the connected elements. For example, if you change the Roof pitch, the Wall that it trims will change accordingly.
Note: In contrast, the Crop to Single-plane Roof function (known as Trim to Roof in earlier ARCHICAD versions), is not associative. Crop to Roof, available for Single-plane roofs only, creates a changed Wall geometry which is static.