Fluent Meshing is very different to Ansys Meshing/Mechanical so tools will not be the same.
Fluent Meshing doesn't need a solid, can you use the "other" workflow? Otherwise, in SpaceClaim, an approach is to use groups to pick a surface and then all surfaces of the same area. Or a seed point and all connected faces. I've not tried this with converted faceted geometry.
You are navigating away from the AIS Discovery experience