If two different shipping classes exist in cart then subtotal them in WooCommerce

I’m trying to achieve the following in WooCommerce:

If two different shipping classes exist in cart then subtotal them in WooCommerce

I’m trying to achieve the following in WooCommerce:

Remove shipping tax costs when the order is below a certain amount in WooCommerce

We need to calculate the shipping charge without tax in some condition on WordPress WooCommerce.