If you need to add the settings in parent theme created section, just place the below code in child functions.php
But remember to replace OPT Name with your_opt_name in “OPT_NAME”.(To find OPT Name just open /parent-theme/includes/options/options-config.php and in top there’s a line $opt_name=”your_opt_name“; )
function add_product_description($sections){
$sections[10]['fields'][] = array(
'id' => 'product_extra_description',
'type' => 'multi_text',
'title' => __( 'Product Description', 'nm-framework-admin' ),
'desc' => __( 'Enter extra Product Description.', 'nm-framework-admin' ),
'validate' => 'html'
);
return $sections;
}
// In this example OPT_NAME is the returned opt_name.
//add_filter("redux/options/OPT_NAME/sections", 'add_another_section_bl');
add_filter("redux/options/OPT_NAME/sections", 'add_product_description');
Also in $sections[10], you need to replace with your indexing. And to find it you need to print_r the $section.