如何从select2 multiselect中的选项列表中删除所选选项，并按选择的顺序显示所选选项

I have select2 multi select field in my form where I want to remove the selected option from the dropdown list after it is selected and again add it to the list if it is removed from the list. And also the added items should be in the same order as they selected. The current select2 (4.0) is not removing the selected the items and and it is showing the selected items in the order they appear in the drop down list, not in the order they are selected.I have select2 multi select field in my form wh