Basically, I have a drop-down list content control with two possible values, Apple and Orange.
When I select either one of them, I want that word to be repeated throughout the document.
I use a dropdown menu with checkboxes to select multiple options for field. Was about to comment that until I noticed your comment.
I am not sure if I need a "validate" or "save" link, or if the user will understand that they just have to click outside the dropdown. This is weird to me too since a drop down's interaction is for a single selection, while check boxes is multiple selections. Try: Deciding a category that each group of options falls into. But a dropdown menu use to close itself when you select an option and maybe the user will not know where to click once the selection is done I'm guessing the drop-down isn't open by default, but instead opened in response to a user action and thus you could assume the user will likely understand they can just tab out or click off to close it again.
Excel drop-down list, aka drop down box or combo box, is used to enter data in a spreadsheet from a pre-defined items list.
The main purpose of using drop down lists in Excel is to limit the number of choices available for the user.
This form element has been in use for many years and some users will be familiar with this convention.
Have you done any research on how to use Bookmarks in Word for repeating words in a document? As far as research goes, I have some before posting, including Bookmarks.