First ask them if they provide CDSL Easiest facilty. if yes, then the process will be paperless (E-DIS) otherwise you need to use DIS to transfer.
Physical DIS is like a cheque book, so you need to fill a form for that to be issued to you. (2nd form in image)
Before you transfer, you need MF to be in DEMAT form, so you need to check if the units are in your DEMAT. If yes, 1st form is not required otherwise you need to process 1st form, wait for it to complete successfully and then proceed with Transfer (above step).
Paytm Money doesn’t provide mutual funds units in demat form.
So, I think I just need to fill the second form to get them into the demat form, and via cdsl, I will be able to transfer it to Zerodha.
I got so occupied thinking that I forgot, I just need to transfer them into demat form as both Zerodha and Paytm are linked with the CDSL depository. I don’t need to send DIS to Paytm.