I have a product on Magento that has a lot of variations (3 layered attribute), varying by Colour, Length and size.
If the 1st attribute is selected e.g. colour=Black it filters and only shows options that relate to products that exist. This works but once you select a second attribute e.g. Length=short it does not shrink the selection of the third attribute to products that exist.
Hope that makes sense. Go here to show an example. We do not have a product that is Black, Tall and 48" to 50", but we do only have Regular & tall in black. http://www.gsworkwear.com/portwest-texo-contrast-trouser-tx11.html
Slight correction, if I have a 3 attribute variation then none of the selections filer in anyway. Really confused now.