What is the first step to open the insert outline dialog?

The first step to open the insert outline dialog involves utilizing the new slide button arrow in the slides group. This action is crucial as it enables users to access the feature designed for adding slides from an existing outline, such as a Word document. When you click on the new slide button's arrow, it displays a dropdown menu that includes options related to adding slides, one of which is specifically for inserting an outline. This is an efficient way to incorporate pre-defined content into your presentation without having to manually create each slide from scratch, ensuring a smoother workflow when developing presentations.

The other choices do not lead to the insert outline dialog: selecting slides from the outline under the view tab is about displaying slides differently rather than inserting an outline; accessing the design menu options relates to formatting and theme selection but not to outlines; and the format menu’s focus is generally on modifying the appearance of text and objects within the slides and does not directly include an option to insert an outline.