1,It's firstly recommended to setup additional PXE-enabled DP and DHCP server in the remote site to have a try.
2,If above suggestion is not applicable in your case, IP helper is needed for remote site. When the PXE client PC, the DHCP server, and PXE Server are located in different subnets or VLANs, IP helper tables need to be set up in the routers/switches so that the PXE network requests can be routed correctly to the appropriate server. Once the PXE network requests are routed correctly, the appropriate servers can answer.
For more information, please refer to:
IP Helper-Address Configuration for PXE Boot
Note: The non-Microsoft link is just for your reference.
Thanks for your time.
If the response is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.