Child/Parent Limitation

Hi,

Plugin is not working with attributes having parent/child relation. I have structure like this

-Management
-hr
-Accounts
-tax
-finance
I have added 2 widgets one for parent and another for child with limitation 1 but unfortunately it doesn’t show 2nd widget with child attributes ,but only shows with parent attribute, please help.
Thanks in advance.

https://www.ads-software.com/plugins/woocommerce-ajax-filters/