Complete the following steps to edit items in a combo box control:
Right-click the control and select Edit Items from the shortcut menu to display the Edit Items page of the Properties dialog box.
Complete one or more of the following actions:
Press the <Insert> key to add an item. (macOS) Click the Insert button.
Select an item and press the <Delete> key to delete an item.
Double-click an item to edit the name of the item.
Drag and drop items to change their order.
Enter a hyphen (-) in an empty cell to create a separator in the list of items for the control. A separator is a thin bar that separates items in the menu of a combo box control.
Note��You can drag and drop or delete multiple items at once by pressing and holding the <Ctrl> key, selecting the items, and completing the desired action. (macOS) Press the <Command> key. (Linux) Press the <Alt> key.
Click OK.
You also can use the Strings [] property or the Strings And Values [] property to edit strings in combo boxes programmatically.