headache to draw nine grids for the floor plan

[myfs_105487]

Dear Master Lee:

I sent this question to you by E-mail already because I can not attache my floor plan due to the big file, I don't know you received it or not, or the question is over the limit for free advice?

My floor plan has the family room, garage, and bedroom4(2nd floor) under the same roof which is lower than the main roof, but the family room is separated from the kitchen area(under the main roof) by half wall, and there is door from the main house to the garage, the 2nd floor bedroom4 is over the garage.

The question is : should I use one nine grid for the whole house, or should I use two nine grids...one is for the main house, and another one for the garage portion (including family, garage and bedroom4).

Hope this question can also help others whose househas attached garage like I do. Thanks in advance for your help.

Michelle