Dynamics 365 - Dynamically Add / Remove Values from a Multi-select Picklist

Following code can be used to dynamically remove a particular value from a multi-select option set:

function RemoveValuefromMultiSelectOptionSet(executionContext, valueInteger)

{

var formContext = executionContext.getFormContext();

formContext.ui.controls.getByName("new_multiselectpicklist1").removeOption(parseInt(valueInteger,10));

}

Similarly, in case a value needs to be added dynamically (or be brought back according to context), following code can be used: 

function AddValuefromMultiSelectOptionSet(executionContext, valueText, valueInteger)

{

var formContext = executionContext.getFormContext();

var newObj = { "text" : valueText, "value" : parseInt(valueInteger,10)};

formContext.ui.controls.getByName("new_picklist1").addOption(newObj);

}