Checkbox to Disable other checkboxes

Best approach to make checkboxes mutually exclusive is to give them same name and different export value as suggested by try67, but if you don't want to change them now you can use this script in any text field as custom calculation script(field can be hidden):

for(var i=1; i<=23; i++){
 var yes = this.getField("Yes"+i);
 var no = this.getField("No"+i);
 var na = this.getField("NA"+i);
 
if(yes.value !== "Off"){
 no.readonly = true;
 na.readonly = true;}
else if(no.value !== "Off"){
 yes.readonly = true;
 na.readonly = true;}
else if(na.value !== "Off"){
 yes.readonly = true;
 no.readonly = true;}
else{
 yes.readonly = false
 no.readonly = false;
 na.readonly = false;}}