If I understand you correctly you have a large site that you divided up for manageability. You can hotlink each section back into one file. Changes made in individual files as you update the hotlinks will be reflected back in the main file.
As for scale, you can save Views at an number of different scales. You save a view at each scale you want to create a final drawing. In this case the drawing refers to the view placed on a layout sheet.
Erika
Architect, Consultant
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
AC5-18
Onuma System
"Implementing Successful Building Information Modeling"