I've just noticed that this seems to be standard - when you go into the Setup room the first bone in the skeleton, the one directly parented to 'Body' (so usually 'Hip' for a humanoid figure, but plain old 'bone_1' in my example below) doesn't have the x/y/zRotate joint parameters that all other bones have.

Here's an example, a 2 bone figure created in Poser's Setup room from an imported OBJ file consisting of two cubes.

Bottom cube's grouped to bone_1 and has only 2 joint parameters that I can edit.

Top cube's grouped to bone_2 and has five parameters

I need to be able to set up the x/y/zRotate joint zones for the bottom cube/bone_1.

How can I do this ?

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).