isc_categories → oc_category Recursively rebuild nested sets (OpenCart uses parent_id + path )
ISC uses isc_product_variations + isc_product_variation_combinations OpenCart uses oc_product_option + oc_product_option_value + oc_product_option_combination (need to rebuild) transfer interspire to opencart
isc_products → oc_product Map: prodcode → sku , prodname → name , proddesc → description , prodprice → price prodname → name