Two companies with separate GCP organizations and billing accounts need all GCP costs consolidated onto a single invoice as of tomorrow. What should you do?

To consolidate costs onto a single invoice, you only need to link the acquired company's projects to your company's existing billing account. GCP billing accounts are designed to manage costs across multiple projects, even those from different organizations. Configuring BigQuery exports would allow for consolidated reporting but not a single invoice. Migrating projects to a new organization or creating a new organization and billing account are more complex operations than necessary for simply consolidating billing. Project migration is typically done for management and policy consistency, not solely for billing consolidation.