Every time that you create a will, you revoke all prior wills previously made. However, sometimes you wish to amend the will while keeping the majority of the terms the same. For these situations, it is best to create a codicil.
A codicil is an amendment to a will. The document can add or delete provisions of your mst recent will. You may also make revisions, such as changing the name of an executor or giving a specific bequest to an heir. When you pass away, your codicil is filed with the Last Will and Testament for probate.
However, if the change is significant, I would recommend preparing a new will.