PM relationships can be used to manage PM releases.
PM Inclusion: PMs defined in a PM's inclusion list (or Sequence list) will be released as work orders when the PM is released to work orders. This relationship can be used to co-release multiple PMs at the same time.
PM Exclusion: Release of one PM excludes one or more other PMs from being released. For example, there are annual and monthly PMs for an asset. When annual PMs are released for the asset the monthly PMs should not be release.
Both inclusion and exclusion can be managed from PM screen's "Dependency" tab.
Menu path: PM module | PM list | PM form | Dependency Tab | PM Inclusion
Menu path: PM module | PM list | PM form | Dependency Tab | PM Exclusion