**Super Menu > Miscellaneous > Annotate...** Note also the **Prefix Start** option under the **Custom Attributes** section in the right hand panel. This allow all prefixes in the schematic to start from the specified number so that for example all the parts on sheet one of a multi-sheet schematic start at `100` and all those on sheet two start at `200`. This number can be changed at any time during the course of creation of the schematic. This allows for example optional components to be easily identified by their prefix numbering. ![enter image description here][1] [1]: /editor/20170828/59a3edd22b18b.png