Hi
If Unit1 is already covered under PF you can use the same for Unit2 aswell. Some online provision is also there I think. Not sure whether it is working or not. You may also contact the existing PF office PRO for clarification.
(The Employees' Provident Fund Organisation launches the Online Registration of Establishments (OLRE) Portal, for allotment of the PF Code number. Employers applying for Online Code may contact tollfree No. 1800118005 between 09:45 AM to 05:15 PM on any working day for any query in this regard.)