You can edit elements on multiple stories only in the 3D window. When you say "grouped" elements, I'm not sure what you mean. If you mean that stretching one element will cause another element to stretch because it is in a group, then no. If you mean that you have identical elements stacked on top of each other (not objects, but tool elements - walls, slabs, etc) ... then you can stretch them in 2D using the bold (fat) marquee and the stretch command. The thin marquee and the stretch command stretches elements only on the current story. The thick marquee and stretch command stretches visible and unlocked elements on all stories.
If the geometry of each story is the same - sounds like it since you are multiplying - then hotlinked modules is a more appropriate way to go so that you only have to edit one story and the others will automatically update.
Alignment to multiple stories in any case is simple. If you just copy elements from one story and paste on another...and then click outside the marquee without having dragged it ... things are precisely aligned.
To multiply objects along a curve and keep them tangent to the curve, take a look at
http://www.arexline.com where Oleg has the rxDUPLICATOR add-on.
For the site plan / multiply, you don't really want to multiply the entire building, whether as modules or not ... but just want to create a GDL object version of just the exterior elements that matter. Turn just those things on, view in 3D from the top, save as GDL object, then use rxDUPLICATOR to muliply that object along your paths.
Karl
One of the forum moderators
AC 28 USA and earlier • macOS Sonoma 14.7.1, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB