1) WooCommerce can’t filter by manual attributes that you added https://prnt.sc/1vzty79
It filters only by global attributes that you created from Products > Attributes https://prnt.sc/1vzu58k
2) Products import option is a built-in WooCommerce option, it’s not a theme option. So, contact WooCommerce support if you have questions about this.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.