Click and drag on the schematic sheet to draw the shape of your component. : Select Component Pin Mode (the icon with a dot and a line).
: For digital testing, you can use the Digital Pattern Generator instrument to "generate" signal patterns (pieces of data) for your simulation. Make a New or Custom Part in Proteus -Step by Step Guide
Place pins on the edges of your 2D box. You can rotate them (using the keypad + or - ) so the connection point faces outward. : Double-click each pin to open the Edit Pin dialog.