The Data Management – Device Sheets page of the Preferences dialog allows you to manage the device sheet related features.
Device Sheets are building blocks developed with the intent of being re-used in different designs. They usually contain predefined circuits that are useful in multiple projects, for example a power supply. A Device Sheet is created and stored as a normal schematic document, in a declared Device Sheet Folder. Rather than being added as a document, they are placed and referenced in a project in a similar way as a component. When the project is compiled, Device Sheets are included in the project hierarchy and can be distinguished from standard schematic documents by a different document icon in the Projects Panel.
By default, Device Sheets are usually configured to be read-only. This gives all designers in the team confidence that they are complete and ready-for-use, and also insures that no one in the design team can inadvertantly modify them. Because they are configured to be read-only, the component designators cannot be changed, nor can the schematic sheet number. The fundamental difference between a device sheet and a regular schematic sheet is that the software has additional features to handle component annotation and the schematic sheet numbering when the project includes Device Sheets.
The Data Management – Device Sheets page is part of the main Preferences dialog that is accessed by clicking the control in the upper-right corner of the workspace then selecting the Device Sheets entry under the Data Management folder.
Include Sub-folders - check this option so all sheets in sub-folders also can be used as a device sheet.