Essential Diagram will let you create new ports and add them to a symbol at runtime. Creating a new Port is just a question of instantiating the required port, adding it to your symbol's Symbol.Ports collection and specifying the Port location. The following code should give you an idea,
The Diagram.Windows\Samples\Symbol Design\PortsAhoy sample that ships with the product shows how to create and add new ports to a symbol.
Symbol mysymbol; // Symbol reference
// Center the port on the symbol
PointF pt = new PointF(mysymbol.X + mysymbol.Width / 2, mysymbol.Y + mysymbol.Height / 2);
CirclePort port = new CirclePort(pt);
port.Location = pt;
Private mysymbol As Symbol ' Symbol reference
' Center the port on the symbol
Private pt As PointF = New PointF(mysymbol.X + mysymbol.Width / 2, mysymbol.Y + mysymbol.Height / 2)
Private port As CirclePort = New CirclePort(pt)
Private port.Location = pt
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