How can you make check boxes select one only?

Ok, thanks! I was referring to the original question about the check boxes. I'm designing the forms in Indesing and was wondering if there is a way to do this in the "buttons and forms" menu. But apparently not. I'll make the changes in Acrobat afterwards. 

Hi All, I see where I can change the export value in options, but it's not working for me. I have a ton of check boxes, but in groups. For example the first group of checkboxes are Emergency, Urgent, Priority, so I renamed each box "priority", then changed the export value from on to off. It didn't work; what am I missing? Thanks in advance for your help. 

Setting up multiple check boxes to select a set number is a completely different issue that requires a script. The script needs to count the number of active checks and then uncheck the last one if it goes over. There are several ways to create a solution but the easiest is to use a MouseUp script

First,  Give all checkboxes unique name, but put them in the same field group.

For example. Name them like this "Check.Box1" "Check.Box2", etc.  

In this case the group name is "Check".  The exports can be whatever you want. I'd suggest keeping the unique export names.

Second, Add this script to the MouseUp on each checkbox

var nMax = 3;
if(event.target.value != "Off")
{
	var nCnt = 0;
	this.getField("Check").getArray().forEach(function(a){if(a.value != "Off") nCnt++;});
	if(nCnt > nMax)
		event.target.value = "Off";
}