I have 4 Cisco SG200 series switches which are daisy chained with fiber. I need to create an extra VLAN but currently there are none on the system. I'm thinking about starting at the front end (server room) and and going to the last one. The uplinks are already trunks but need to make sure they are passing the VLANs. I guess the best approach would be to add all of the current devices (surveillance cameras) to a vlan and when that works I will have a working platform to add the second vlan. Should they ports be tagged when adding them to a vlan?