Two ways that this off-platform job can be established without additional third-party tools are:
Install a minimal set of dev tools on a machine such as the Command Line Interface (CLI) and create appropriate scripts to import files containing the data. The CLI is a tool that allows developers to interact with Salesforce from the command line. The developer can use the CLI to create scripts that use commands such as force:data:bulk:upsert or force:data:tree:import to import data from CSV or JSON files into Salesforce.
Authorize a machine against the Salesforce org's APIs with appropriate security measures and create a script to call the APIs. The APIs are interfaces that allow developers to access data and functionality in Salesforce from external systems. The developer can use the APIs, such as REST API or Bulk API, to create a script that authenticates with Salesforce using OAuth 2.0 or JWT, and then performs operations such as insert, update, or delete on Order data.
Verified Reference: https://developer.salesforce.com/docs/atlas.en-us.sfdx_cli_reference.meta/sfdx_cli_reference/cli_reference_force_data.htm https://developer.salesforce.com/docs/atlas.en-us.api_rest.meta/api_rest/intro_what_is_rest_api.htm https://developer.salesforce.com/docs/atlas.en-us.api_asynch.meta/api_asynch/asynch_api_intro.htm

Explanation
Three statements that are true about change sets are:
Sending a change set between two orgs requires a deployment connection. A deployment connection is a link between two orgs that allows one org to send change sets to another org.
Change sets can only be sent between orgs that are affiliated with a production org. A production org is an org that is used for live operations and data, and it can have one or more sandbox orgs that are used for development and testing. Change sets can only be sent from a sandbox org to its associated production org, or from one sandbox org to another sandbox org that shares the same production org.
Change sets can contain only modifications made through the Setup menu. A change set is a collection of metadata components that can be deployed from one org to another. Metadata components are customizations that are made through the Setup menu, such as custom objects, fields, workflows, etc.
Verified References: https://help.salesforce.com/s/articleView?id=sf.changesets_about.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.changesets_components.htm&type=5

Explanation
The correct time and way for creating an Invoice is at any point after the Fulfillment Order is created, by customizing flow "Create Invoice". This flow is a core action that creates an Invoicerecord from a Fulfillment Order record, and updates the status of both records accordingly. The administrator can customize this flow to suit their business needs, such as adding conditions, actions, or subflows. Verified References:https://help.salesforce.com/s/articleView?id=sf.flow_ref_elements_om_actions_create_invoice.htm&