I want to use Shopify POS Pro . But I have noted one difficulty in it. I can sell in my retail shop , but I cannot generate a GST invoice, I need a app to do the same. Also, I have to activate tax calculation for each product but that will also get activated for online. Whereas in online I have kept Inclusive of GST. We are also selling on multiple sales channels apart from Online webstore and Physical shops, how can we have those added to the Shopify ( Whole sale / Instagram / Exports ) If I punch these invoices through Point of Sale in Shopify how can I add a tag which sales channel it has been sold through.