I have 4 drop-down lists / group of checkboxes in I need that after making a selection in any one list the options available in the other 3 lists change accordingly...either are not available for selection or are not present in the list itself.
I'm coding using PHP & MYSQL Could someone please help me with this. I'm new to PHP.
This can not be done with just PHP and MySQL. You need to use Javascript or jQuery. jQuery is the easiest to learn.
You can do it but very hard. You should use jQuery, it's easier than PHP.