How can I modify the plugin to enable multiple tracking numbers for a single pro

How can I modify the plugin to enable multiple tracking numbers for a single product in an order? By default, the plugin only allows one tracking number per product. However, my products, such as large furniture items, are shipped in two or three separate packages. After purchasing the plugin, I realized that it does not support multiple tracking numbers for a single product. Please guide me on how to make the necessary modifications to achieve multiple tracking numbers for one product.