Wha't the best practice for managing a project with a simulation sheet?

So I have my project, before building it I want to simulate it’s behavior with ngspice.
The optimal solution in my opinion would be the following layout:

  • Project
    • schematic.kicad_sch
    • pcb_layout.kicad_pcb
    • simulation.kicad_sch

The problem is that kicad is not allowing me to add a new schematic without it to be hierarchical.
Do I really have to create a new project for that? is there a way to do it elegantly?

Creating an extra project for the simulation is probably the easiest. I would put it in it’s own sub directory, maybe even in the “documentation” tree part of the project.