Hi Dima, good question. Just to clarify the woo_pd_create_product_addons WordPress Filter is only accessed when importing new Products while woo_pd_merge_product_addons is only accessed when merging Product changes.
You could detect this state earlier by accessing the WordPress Filter woo_pd_prepare_product and accessing the $import and $global arguments passed as part of that WordPress Filter.
For instance while using the woo_pd_prepare_product WordPress Filter:
// Merging
if( $import->import_method == ‘update’ ) {
// Do something only when merging Products
}
if( $import->import_method == ‘new’ ) {
// Do something only when importing new Products
}
Does this help? Feel free to open a Support ticket if required or let me know what point in the import process you want to make the modifications
