Yes, most types of Will allow you to update it and make changes as often as you like. Online platforms build this functionality into their services, and lawyers will of course allow you to use their assistance as much as you need (for a price). The only Wills that offer no room for modification are DIY Wills, which need to be rewritten from scratch every time. After you update your Will, you must sign it to make it legal, and you must destroy the old Will (which has become invalid).