woocommerce - Create Attributes and Linking Attributes to Product -

i'm having trouble creating attributes products using woocommerce. example have products have different color. main attribute color , variables red, orange , purple.

i have tried following unable set it.

wp_set_object_terms( 165, 'color', 'pa_colour' ); wp_set_object_terms( 165, array("red", "orange", "purple"), 'pa_colour' ); 

how create attributes first , link them product? there simple way first create attribute create variables link product?

update: i've been able research , able create attribute.

$wpdb->insert(     $wpdb->prefix . 'woocommerce_attribute_taxonomies',     array(         'attribute_label'   => $data['attributelabel'],         'attribute_name'    => $data['attributename'],         'attribute_type'    => $data['attributetype'],         'attribute_orderby' => $data['attributeorder'],     ) ); 

however, when tried following code:

wp_set_object_terms (165, 'variable', 'product_type'); wp_set_object_terms( 165, array("ta", "tb"), 'pa_testing' ); 

i check backend see product linked attribute textbox values missing. not able enter variation page product.

anyone have idea?