Entering a Level of Hierarchy
To enter a lower level of hierarchy, click on the Hierarchy Push/Pop icon and double click on the symbol
To go back to a higher level of hierarchy, double-click on a blank area of the sheet.
To create a symbol for a schematic with I/O terminals, use the command: Hierarchy>Create Macro Symbol From Current Sheet
This will place a symbol in the project library so it can be added to the top-level schematic