I haven't found anyway that the array can apply to a series of fields together as a whole instead of one by one?
For example if I have 10 checkbox fields with 4 choices in each out of the 40 checkboxes I only want the user to be able to check 1 box out of them all.
David has this setup for individual field sets here http://gravitywiz.com/2012/06/11/limiting-how-many-checkboxes-can-be-checked/
However this applies to me trying to create a price grid. I can't do individual row labels if I have all of the items in 1 field list. To achieve the closest option I have to use multiple field sets stacked onto each other but visitors would be able to select more than one option because they are in individual field sets.
Make sense?