Here are the list of companies, the India company is the parent company for other two companies US and UK

Here are the list of products in system

Here are the list of customers/contacts

Here are the list of sales order

Here are the list of customer invoices created from sales orders

When you create any vendor bill, it will giving you an option to auto create sales invoice to parent company by selecting checkbox Auto Create SO
Also given button Add Invoice Lines to auto populate lines based on customer invoices where you can select invoices to pay to parent company

When you select invoices and click Populate lines, it will create lines products wise

When you validate vendor bill then it will auto create sales invoice to parent company, also it will flag to customer invoices that are populated from wizard, it will not show in next time invoices selection time.

Now go to parent company e.g India and here you can see one invoice