Rotate group of objects around global axis

[PGriffith]

Depending on what you're doing with these shapes, you may have a vastly easier time if you can wait for 8.1.10 and the piping feature:

New Feature: Perspective Piping

Introducing Perspective Piping, a major new Coordinate Container feature available in the next nightly. Perspective Piping allows you to quickly draw pipes within Perspective. [1] A new Coordinate Container Prop named “pipes” has been added to the coordinate container. Each pipe is an object containing a name, appearance, various appearance specific props, and an origin. An origin is the (x, y) start point for the pipe. Each origin may have any number of connections, and those connecti…