Add a new plan bellow current level

[mengine]

Hi,

I started on a project where I began at the 3rd floor. Now I am not able to figure out how to add a plan below my current plan. I am however able to add new plans above

[Puybaret]

Once created, change the elevation of the new level with Plan > Modify level menu item.

[mengine]

Ahh, I entered a minus value and it worked thank you, saved my day!