Yes, and the order they are in decides which wins on a product that both cover. The first campaign that applies is the one that shows, so a campaign for one category should sit above the one for the whole shop. Move a campaign with the up and down arrows in the Order column of the Campaigns list.
The same order decides the site-wide bar: only the highest campaign with that placement is drawn, because two bars fight for the same strip of the page.
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