I need help making an item list for multiple drop down fields to use

Do you mean like a "master" field where you could update it and then copy those updates to the rest of the fields?

If so, you can do it using this code (you can run it from the JS Console or a button):

var items = [];
var masterField = this.getField("LastNameMaster");
for (var i=0; i<masterField.numItems; i++) {
	items.push([masterField.getItemAt(i, false), masterField.getItemAt(i, true)]);
}
for (var i=1; i<=26; i++) {
	this.getField("LastName"+i).setItems(items);
}