I'm not sure if this is a FW or NAT issue, so my appologies in advance.

I'm somewhat tech savy, and have been using pfsense for years at home SOHO setup.  I need it to work at my office now, but the office has a windows domain controller, i believe some commercial brand of firewall and router.  It also has a server i use daily for office work.

I've got the pfsense WAN working to where i can access the internet on my work PC, but i need to be able to access the work data server.  on wan, i put the domain name, and i changed the gateway so i can access the internet (had to do this before to SSH to home from office).  My LAN on pfsense is a different subnet.

Do i need to do a firewall rule, or do i need to do a NAT rule?  Or, in the alternative, do i need to do something else?