编辑Woocommerce产品属性并将其链接到外部页面过滤器

I am working on a product filter page designed as a form with multiple tabs ending with a submit button. Each tab contains a number of checkboxes and spaces to fill with length and width other with height.

I need to :

  • Select product attributes through these checkboxes (i readed on a similar question that this task could be done by editing a php file by including a meta-query but i need more details on how and where to do that because the filte is on a seperate page from the store page).
  • On another tab i have as i said spaces to fill with length and width and i want to select attributes depending on result of length x width (3 ranges), so how to link that results with the attributes (global attributes).