MultiList_Add & MultiList_Subtract

MultiList_Add adds one or more value(s), to the selected values of the multi-select question at runtime

To overwrite any currently selected values before adding a new set of values, you must first clear the already selected values by using MultiList_Add and set the question to [no values]

MultiList_Subtract works in a similar way, but will remove the the value from the list of selected values of the multi-select question