To use the system in question as a an OpenVPN server?
If so, then as far as I can tell everything remains normal. It's only connecting devices/clients that have their network stuff changed for accessing things outside of the LAN. On my laptop and phone all my web traffic seems to go through the VPN and local traffic moves as normal.
I guess with a true business VPN you should be able to get access to that servers internal network from the VPN clients. No idea if I can do that. Probably possible if various interfaces are bridged or something.
Okay, since the topic suggested me about cheap vpn, I found this Purevpn review and got the most cheap yet with extra feature vpn. I am not sure I'll get it this week, I am running low on Nord's subscription but I think I'll buy this one.
I was using PureVPN and every time I got the issue about it that's why I want to switch to another VPN in reliable price after searching someone suggests me the article where guide about the best cheap VPN is given after following the guidelines I switch to NordVPN. It's really good cheap VPN.