Derive Floor

[Tacohen]

Can I derive a first floor from an existing second floor plan?

I created the second floor first because we are adding a bathroom and 2 bedroom to a dormered attic.

Now that we are satisfied with the layout, I want to layout the rest of the house, first floor.

Is this possible or do i have to create a new file.

 If so, is there a way to combine the files once finished with the designs?

Second floor plan2.pdf

[Tacohen]

Just opened the program and just started the second floor. 

Now I want to draw the 1st floor. 

I know it's backwards, but the 2nd floor was the design problem.