It is a common method for ERP systems to create orders into Shopify or vice versa. For example we usually import orders from Shopify into the ERP platforms our users connect to. We do also export/create orders from other systems/stores into Shopify. You can check out the API docs: https://shopify.dev/api/admin/rest/reference/orders
Bundleup - bundle your products and unbundle your orders. MYOB Sync - connect your MYOB account to sync orders, customers, payments and inventory. Get in touch with our team here.