Walls are system families. System families exist ONLY in the project environment. if you need a wall type not currently in the project you will need to duplicate an existing wall type that is close to what you want and modify the type perperties of the wall.
I understand You cannot edit system families. How do i create a double t wall type and have it act like a wall? I can create components but in a 300 foot wall that is a lot of components to place at 10 foot each. how can i make more than just a regtangular wall shape? In the detail items you have a double t profile but how do you attach that profile or any other profile to a wall? and make the whole wall use that profile?
I assume you are talking about a double tee concrete panel wall? So the "tee" is visible in plan? This is not able to be created with a "wall". You can create a component and use then array command to place multiple tee panels in the project.
You can't edit the wall to use the "tee" profile in plan.
I am able to use the curtain wall to create a double t wall by creating a curtain wall panel family. however it only works as well as the curtain wall will allow. And I had to create a small piece of panel to offset for the sides and delete the system panels in my project. othere than that i guess i will use the components