DIODE - ADS
In the separate sheet with the diode model(all possible parameters enabled) and the diode you just draw, place two ports by clicking "insert port" icon on the toolbar.
Then you have the ports to connect with other circuit.
Choose menu"view"->"Create/View Schematic symbol",a dialog would pop out, choose OK, then select all ,delete the symbol on the sheet.
Then choose menu"view"->"Create/View Schematic again to return to the sheet before.
Now choose menu "file"->design parameter , chosse the symbol name as" symbol DIODE", name the diode in the "description" block.
Save it .
Now you have a symbol you created.It was under the project you are using .
On other sheet, click the "display component library list" icon ,to bring the symbol out, It's under the project you created. click the symbol name(or maybe the schematic name of the diode) on the dialog once ,it will appear on the sheet.
Try it.