Final answer:
The command to add a Quick Part to a document is located under the Insert tab on the Ribbon menu in Microsoft Word.
Step-by-step explanation:
The command to add a Quick Part to a document in Microsoft Word is found within the Insert tab on the Ribbon. Quick Parts allow you to insert reusable pieces of content such as text, fields, document properties, or even graphics, helping to automate document creation and ensure consistency.
When you are looking to add a Quick Part, you just need to navigate to the Insert tab and look for the Quick Parts command typically located in the Text group. From there you can select from your saved Quick Parts and insert them into your document wherever you require.