I forgot to include my purchase of energy efficient heater/air conditioner on my tax returns that have already been submitted and accepted. I was able to fill out an amendment (1040X) for the federal tax, but how do I do it for the CA state return. There is a list of potential tax credit categories and energy efficient installation doesn't seem to be on the list. How do I submit the amendment to the state? And does the state allow tis category of tax credit?