If you delete a Master dimension or Master measure, the visualizations that use the deleted Master item will not work unless you replace it with a new dimension or measure. The same applies to delete a field from the data model; the reference will remain part of the Master item pane until it's updated from the edit screen.

Creating master measures replaces the need to write expressions as variables for reuse. Another piece of QlikView functionality that has been replicated and expanded upon is the concept of linked objects. Any updates you make in the Master visualization area will be applied globally.

If you rename a field in your script without moving the position, it will be applied automatically to all the objects.