How to edit the order which is created outside the Shopify POS using the Shopify APIs

Shopify Partner
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1. We have a web appliaction
2. We use Shopify APIs to create the product and customer in Shopify.
3. We create an order using the Shopify APIs
4. This order appears on the Shopify POS.

We need to perform below things

1. We need to add tax ( USA - County tax for Orange county which is 8%) to this order through the POS terminal
2. We need to edit the Order through the POS terminal - add/remove more products
3. We need to add/edit Shipping address for the order through the POS terminal

We are not able to do these operations through the POS. What is the best way to achieve this?