In any format, a very large chart is cumbersome to view. An org chart showing every employee of a large company like GE is impossibly too big and complex to be useful. A more manageable approach is to break the organization up into smaller groups, each with a reasonably-sized org chart, and then link them together. For example, here is GE's top-level organization chart:
Each of the presidents heads up a different company within GE. Their positions can be linked to the org chart for that company. For example, the box for Healthcare links to the org chart for GE Healthcare:
The healthcare chart itself is so large each of these positions links to charts for the CIO's organization, the Business Development organization, and so on. Each sub-chart links back to its parent, so no matter where a reader is in the hierarchy, they can find their way back to the top.