You can use a Codicil to make many different changes to your Will within reason. Some common things people change in their Last Wills using Codicils include:
Changing the beneficiaries of your estate, assets, or gifts
Changing the guardian for your children
Changing the executor of your Will
Updating an executor’s, beneficiary’s, or guardian’s name
Adding assets or gifts that you may have forgotten in your original Will
Adding new assets or gifts you acquired after creating your original Will
Adding or removing specific bequests