AI Artboard Master Reference for Other Artboards to Generate From

Hey there! As a designer, I often create 5 different banner sizes for each advertiser, starting with the largest size (300x250). However, this can take up quite a bit of time. I was thinking about how we could make things more efficient and came up with an idea for a 'Master AI Artboard' for the 300x250 size. This would automatically generate the other sizes based on this design, saving me valuable time. I could then easily tweak any elements that don't look quite right. It would be amazing if I could see all five sizes in real-time, with each artboard referencing the 'Master AI' 300x250 design. This would help me create multiple dimensions more quickly, while also ensuring that the design elements are consistent across all banners. What do you think?