If the business you are deleting from your personal Woobox account is a Facebook page or is on a subscription administered by another user, other Team Members will still have access to the business and its campaigns via their personal Woobox accounts. The business will only be deleted from your account.
While managing as the page you want to delete, go to Business Settings from your account panel in the upper right corner.

…or click Settings to the right of another business in your list.

Then scroll to the bottom of the page and click Delete Business.

Confirm the deletion on the pop-up that follows. The business will be deleted and you’ll return to the Manage Businesses section of your account.