walls with automatic segments

[twdesign]

I am trying to create a wall stencil that puts in automatic 4 foot segments and behaves similar to a decking stencil. i.e. when the wall is extended to 30 feet for example there will automatically be segment markers four foot intervals similar to how the deck stencil adds boards in the correct proportion as the area is increased.

Is this possible or am I limited to dragging and dropping each 4 foot section?