How to transfer PF, No UAN for previous company

How to do ? Should ask current employer to create new UAN and link my old PF to new PF?

Provide your current (Old UAN) to all upcoming employers . Now , no need to transfer formality required. Amount directly goes to existing UAN linked account.

Only give your old UAN number to current employer and your epf from previous company can automatically transferred but make sure that your aadhar card updated in UAN number.

Linked 2nd company UAN to current (3rd), but 1st company doesn't have UAN. How to do?

EPFO's new service: Merge multiple provident fund accounts at one go
Retirement fund body EPFO has opened a new facility for its over 4.5 crore members that will allow consolidation or merger of their multiple PF (provident fund) accounts with the current universal portable account number (UAN).
Under this facility, subscribers of the Employees' Provident Fund Organisation (EPFO) can merge as many as 10 previous accounts with their UAN at one go.
Currently, the EPFO subscribers are required to file separate transfer claims online using UAN on the EPFO's UAN portal. But to avail of the facility, they are required to activate their UAN that is seeded with bank accounts and other details such as Aadhaar and PAN. “one employee, one EPF account”.
The EPFO, according to the official, has already issued direction to its over 120 offices earlier this week to use this service and ensure multiple accounts are consolidated as early as possible.