Hello kerim

Thank you for your purchase.

I am sorry to disappoint you, but unfortunately something like this is not possible with the plugin's built-in features.

One of our customers found a workaround for membership option, and I'll share his comment with you:

I use memberpress as membership plugin. Memberpress has a addon to link my membership levels to any wordpress user role. So I have linked my levels to the Amelia Customer user role. So each time a member sign up, also assigns the member to Amelia Customer. During the first appointment, all fields are grayed out since Amelia recognizes them as existing customer! This is perfect for me.  You may want to share this technique with others that want similar solution (even with other membership plugin).