Macros
A macro is a part of scheme that you have already drawn and you want
to re-use in another drawing or another electrical project. Macros are
stored in a library.
There exist several types of macros,
such as scheme macros, line diagram macros, project macros, or PLC macros.
Some of them are used in automatic
drawing generation (PLC macro) and others must be manually inserted by
the user (scheme or project macros).