Better still, get hold of a copy of Trueview. This is a free plugin that works on most versions of Truespace. This lets you drag and drop bits of model, lights etc. in Truespace without worrying about 'glue'

Whatever utility you are using to convert a model into a Freespace object, the thing is expecting to see 'groups'
In your truepsace scene, you usually have your model mesh, and a couple of lights as default. Your model must be part of a group. The simplest 'group' you can build is your mesh, plus a 'local light'. Each Truespace group must have a light at the end of it. If you do this is Trueview, you will actually see the group formed. Much easier to comprehend that way

Also, all the parts in a model need to be arranged in a certain way.... the 'hierarchy'. Every tutorial I have scene on the subject uses Trueview to show the structure. Get a copy...

p.s. If you are NOT using Truespace to build the hierarchy, but are using another program to create a truespace COB file, you are not going to get this right. All youa re doing is building up a world of headaches! There is ( I think it is still out there ) a free version of Truespace 3.2. Track it down and get a copy!