If you let them continue growing they will flower. And if it's an OP and not a hybrid onion, you'll get seeds if you have some pollinators around.
If it's a hybrid, it's pretty certain to be male sterile, therefore having no viable pollen they won't make seeds unless you have another OP onion blooming at the same time.
If it is a hybrid, or if you don't want seeds, then green onions is about the only use for those. You can cut and let them regrow until you never want to see another green onion.
OTOH if the onion has some multiplier genes, you might get divisions and then small bulbs that you could replant in fall or spring... Alliums always seem to have a backup plan, to keep themselves going.
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