I have followed the advice "To add a mounting hole" on the "Add pad" page in the help section, but the mounting hole behaves as a pad and therefore does not match the 3 pin schematic as the PCB symbol now has an extra fourth pad.
I came across a help article "How can I create a LCD module as a component?". That suggested I change the mounting pad layer from "All" to "Document". but I am not given that choice it is "ALL", "Top" or "Bottom". If you have any helpful advice -let me know.
In the mean time I shall create a new triac schematic symbol with 4 pins and see if that gets around the problem.
I am running DesignSpark 10.0.0