In our environment, we have a VCSA and PSC which are 6.0. We want to go with 6.7 (Embedded). Can I just build a new VCSA appliance with embedded PSC or is there a better way to do this? I am leaning to just building a new VCSA appliance but if that is the wrong approach, I would love to hear why and the how to so I can make sure I do it right the first time.
Plan to use embedded PSC, because the external PSC will be deprecated in the future releases of vSphere.
You can migrate the VC and PSC to 6.7U2 appliance and after you use the converge tool to decommission the external PSC.
External Platform Services Controller, A Thing of the Past - VMware vSphere Blog
Upgrading the vCenter Server Appliance and Platform Services Controller Appliance