If you have not transferred the old PF, you can either do it now and take advance from the present PF or withdraw the whole of the previous PF. For taking advance for the purchase or construction of a house, you need at least 5 years of membership in PF, and it is possible to do so once you have transferred the previous accumulations to the new one. By doing this, your pensionable service will also increase by 5 years.
Under normal circumstances, an employee who is already a member of PF is expected to transfer the old one when joining a new organization and is not expected to withdraw it. However, the transfer will take its time, and the time of the transfer's effect depends on the persons working in the PF Office. Therefore, if you need money immediately, you can go for withdrawal. By doing this, you will be losing your past service. Still, getting your claim settled also depends on how efficient the service is in the PF office.
Madhu.T.K