Not from within your account.

All invoices generated from your Harvest account are designed to be from your company to your clients. Harvest isn’t set up to handle internal invoices or reimbursement.

An alternative would be for your contractors to set up their own Harvest accounts and invoice you from there, instead. They can export their time from your account and import it into their own to generate the invoice.

To help you match up hours with any contractor invoices you receive, you can head to the Contractor Report in your account. That report will allow you to easily see all active contractors along with their total hours and cost within a given timeframe.