Port forward between two interfaces

I have the following setup

1 x HP server as a Default gateway running Zentyal

1 x vXrail Running Vcenter

In the HP server eth0 is connected to the vCenter server

Eth1 is connected to the company’s network.

I am able to SSH to the HP server within the company’s network.

So, my basic network configuration is done.

However, I would need to access vCenter, how to port forward between two interfaces

For an example:

HP server External IP : x.x.x.x

vCenter IP: y.y.y.y

I would need to access vCenter by connecting to my company’s’ network and browsing to x.x.x.x:8080

Can someone kindly advice, my apologies if this is a silly question