Block identifiers – or block IDs – are unique names that you can apply to individual blocks. You use a block identifier to mark a block that you want to find quickly using Edit > Find and Edit > Find in Diagrams.
To add an ID to a block
1. Choose Edit > Assign Block Id.
2. Click the block to be assigned an identifier.
3. Enter the identifier and click Assign. Block identifiers can consist of alphanumeric and special characters.
4. Save the diagram.
To remove an ID from a block
1. Choose Edit > Assign Block Id.
2. Click the block whose identifier is to be removed.
3. Enter the identifier and click Remove.
4. Save the diagram.