IndustryData-ReferenceDefinition.ReadWrite.All

const options = {
	authProvider,
};

const client = Client.init(options);

const referenceDefinition = {
  '@odata.type': '#microsoft.graph.industryData.referenceDefinition',
  referenceType: 'RefGradeLevel',
  code: 'TestGrade',
  isDisabled: false,
  sortIndex: 300,
  displayName: 'New Test Grade Level'
};

await client.api('/external/industryData/referenceDefinitions')
	.version('beta')
	.post(referenceDefinition);

Import-Module Microsoft.Graph.Beta.Search

$params = @{
	"@odata.type" = "#microsoft.graph.industryData.referenceDefinition"
	referenceType = "RefGradeLevel"
	code = "TestGrade"
	isDisabled = $false
	sortIndex = 300
	displayName = "New Test Grade Level"
}

New-MgBetaExternalIndustryDataReferenceDefinition -BodyParameter $params

# Code snippets are only available for the latest version. Current version is 1.x
from msgraph_beta import GraphServiceClient
from msgraph_beta.generated.models.industry_data.reference_definition import ReferenceDefinition
# To initialize your graph_client, see https://learn.microsoft.com/en-us/graph/sdks/create-client?from=snippets&tabs=python
request_body = ReferenceDefinition(
	odata_type = "#microsoft.graph.industryData.referenceDefinition",
	reference_type = "RefGradeLevel",
	code = "TestGrade",
	is_disabled = False,
	sort_index = 300,
	display_name = "New Test Grade Level",
)

result = await graph_client.external.industry_data.reference_definitions.post(request_body)