You can purchase Photoshop Photography Program and if you want you can switch to Creative Cloud as well or vice versa.
In that case you can cancel any one membership and there would be no cancelation fees and you can continue with the other one.
Let us know if that helps!
As correctly suggested by Garima, you may cancel the subscription and then place the order with the help of Customer/Chat support:
You may also refer to the following link for the cancellation: