Syntax example: product_cat>pa_size,by_instock>pa_color. In the example described: if a user will select a [product category] then filter by [pa_size] or [by_instock] will be appeared [pa_color]. For shortcode [woof] use an attribute: [conditionals]. Use line break in the textarea to define some rules (press Enter keyboard). In [woof] shortcode to define some rules use sign: [+].