I think this is the right group

I have set up a DMZ on a BM 3.7 (3 interfaces: LAN,WAN and DMZ) server. I have run brdcfg on the DMZ card.
My question is:
Is it possible somehow to work on the DMZ interface without disrupting the WAN to LAN traffic? e.g. load and unload the filters on the DMZ card

I would be grateful for any assistance