Adding new Variant to CalulatedOrder with CustomAttributes

GraphQL Admin API Troubleshooting
1

I am trying to add a new LineItem to an existing Order. I tried orderEditBegin mutiation, which yielded CalucaltedOrder and I can add ProductVariant using orderEditAddVariant mutation, however, the CalculatedLineItem now present in the CalculatedOrder has CustomAttributes empty and I cannot find a way to add those.
There is also a possibility to use another mutation to add CustomVariant, but it doesn’t seem to allow specifying sku for the resulting LineItem.
So, is there a way to add extra LineItem with sku and non-empty CustomAttributes to an existing Order?

2
  1. Start an Order Edit Session 2.Add a Custom Item (Manual Line Item with Custom Attributes) 3.Commit the Order Edit
3

Hey @Leon_Czolgosz,

The current options for editing orders are here: Edit existing orders

Currently, none of the available mutations inputs enable adding custom attributes to the variant, or custom items.

A couple of options would be to use the orderUpdate mutation to add order level custom attributes. Alternatively, storing custom data in order metafields may work as well.

4

But this won’t allow adding sku to the new ListItem, will it?

5

For others who might be interested in this, using GQL API 2025-07:
1). I tried adding a tag to a LineItem and it does not work.
2). I tried adding a metafield to a LineItem and it does not work.

6

So LineItems which do have custom attributes have had them attached at the point when the order was being created?

7

Thanks for sharing the testing you have been doing.

You are correct, for line items this has to be done at the time of order creation.