Choose State Return in the menu that asks you why you are amending your return if you don’t see Add a State. You can add a state in the state section.
It’s possible you may have to amend your California return if you are adding Georgia, depending on your situation. For example, if you were a part-year resident but reported all your income to California, you may have to amend CA to split your earnings.
If you were a full-year CA resident with GA income, you can claim a credit for any tax paid to GA on your CA return.