The Paste tool inserts elements from the clipboard to the current view or a different view. This tool is available only after cutting or copying elements. You can only copy (or cut) and paste elements within the same session of Vasari.
The Paste Aligned tool allows you to copy multiple elements on one level and paste them to another level exactly above or below the location of the original elements. This tool is most useful for multi-story buildings, where you can copy and paste aligned elements from one level to many other levels.