There is new type of user in Torch Project Management: Limited Internal User. These users are intended for temporary workers in your company. Unlike internal users, they only have access to projects you assign them to.
Like standard internal users, they can enter time and expenses and a standard/admin internal user can import that information onto an invoice. However, limited internal users can't export time and expenses and they can't create bids, invoices or see budgets.
When you are creating/editing an internal user, you will now see this drop down: