Some in-depth questions

[Angadil]

What I called "line" is a building "type", the one wich begin by:

building name_of_the_thing

and where you then can define several levels of this type (actually, you're right, it is not really a line since you ca defien several "branch" as EB team did for arenas/gymnasiums.

Yup, that's a "building complex", at least in EB-speak.

Hum.... 64 max HR, 64 max building complex......... is it a dream to hope a building complex can have 64 levels max???

Maximum is 9 levels per complex.