To display a layer the same way at multiple scale thresholds, save the styles to the Library. For each new scale threshold, reference the style in the Library. Any changes you make to the style at one scale threshold are reflected at the other scale thresholds.
Example: Reference the Library Style for the Road layer at all scale thresholds except when you are zoomed out. For that scale threshold, turn off referencing so you can change the display of roads when you zoom out.