Hello I am creating an addon for blender. I have rigged a character, with controller handlers, sliders to control the rig, etc.

I need now to understand how to create a custom 3D menu to append the whole scene in my viewport, just a way to make it less boring than appending it everytime.

I learned how to add a custom object, but I am encountering difficulty in making a custom menu to append an entire scene.

To be clear I want to add a custom button under the bone and armature section when you hit ⇧ ShiftA to append in the 3D scene.