Translation Office 3000 is designed for freelance translators which do not deal with outsourcing. Therefore, there is no way to add subcontractor-related data. I would suggest that you check out another piece of software by AIT - Projetex.

Projetex is geared towards translation agencies, and so it allows you to assign jobs to other freelance translators and keep track of them. You can find more information about Projetex and download a trial version at the web-page: https://www.translationmanagementsoftware.com