You can copy an artboard in Illustrator using shortcuts, a panel option, or a tool. You probably already tried Command/Control + C, what went wrong?
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How To Duplicate Artboards In Adobe Illustrator
3 Easy Ways to Copy an Artboard in Adobe Illustrator
3 Easy Ways to Copy an Artboard in Adobe Illustrator
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3 Easy Ways to Copy an Artboard in Adobe Illustrator
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3 Easy Ways to Copy an Artboard in Adobe Illustrator
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