Building with 3 platforms @ ground floor

Hello

After the weekend i want to scan  rather big building with two main floors but

at gound floor there are 3 platforms (2nd is about 30 cm  above 1st, and 3rd is even higher - about 40cm above 2nd) 

My question:

Should I scan lowest level - then start another Floor (in App) for 2nd platform and 3rd Floor (in App) for 3rd platform. In the end I could have 4 Floors (1,2 and 3 for Ground floor) and 4th for second Floor for actual building floor?

Is this a proper way to make a scane like that?

Or this 30cm and further 40cm lvl difference is not that important?

Please help.