You can't unless you design a fieldtype or tab plugin to render the inputs how you want and implement custom saving methods for them. For this it'd be best to use a fieldtype plugin as you can render multiple fields with a single field (like the password field does) then have your own storage behavior for it.

The alternative is to create custom inputs using a delimiter field then using CB Auto Actions to grab them POST then store to database after combining their values on the after profile update trigger, but it's no where near as good as doing it as a proper fieldtype.