Viewports are added from the Visualise menu on the Anaplan XL Ribbon.
Specify the source range to be displayed and where to insert the viewport control. You can also define the placement options and border settings.
After insertion, the viewport control can be scrolled. Any grids it contains can be drilled, and xl3link() and grid active cell settings are retained.
Excel limitations
The viewport will only update when a cell value in the referenced range changes, so if it contains a chart or image, you may need to add a "Helper" cell to trigger the update. This can be a reference to a cell that'll be updated when the chart/image needs to be updated (it can be hidden or formatted so that it doesn't display anything).