Add Remove Dynamics 365 CRM OptionSet Field Values

To remove Dynamics 365 CRM/CE OptionSet field value using Java Script you have to use the removeOption() and addOption().

// To Remove OptionSet option

// Option : C# Language    Value: 913420003
formContext.getControl("fieldSchemaName").removeOption(913420003);

// To Add OptionSet option

var optionAdd = { value: 913420003, text: "C# Language" };
formContext.getControl("fieldSchemaName").addOption(optionAdd);