current bug with woocommerce

I’m looking for heirachical attributes – if they proceed to the next ones not ALL posibilities will show….

basically the user must choose from

1. Style eg square landscape or portrait print

2. then size of print – Note: not all sizes will be available based on the choice in step 1

then

3. Material – eg paper

4. then Frame – black white or none

the

5 glass perpex or none

then the designer comes up depending on what they choose …
apparently there is a bug in woocommerce that can be fixed by adding this to the function.php file

function custom_wc_ajax_variation_threshold( $qty, $product ) {
return 110;
}

add_filter( ‘woocommerce_ajax_variation_threshold’, ‘custom_wc_ajax_variation_threshold’, 110, 2 );

Where to put in your theme files ?? Thanks