The screen capture you have provided is NOT from Word and there isn't a simple way to do that. To arrive at a similar solution you need to consider 'when' the decision to remove all the non-selected items is supposed to occur because once they aren't there it can be difficult to change your mind or revisit them.

I'm thinking you could have two different ways to address this:
1. Put a series of check box content controls inside a rich text content control and have an on exit macro change visibility as you exit the rich text CC. Include a second macro to show all options as you enter the same CC.
2. Build a vba userform to show all the options and post the result to the document when the user closes the form.

I think you need to post a document which shows the context of what you want so we can see how it might be used.

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Andrew Lockton
Chrysalis Design, Melbourne Australia