Download and install the free utility 'MAT Pose Edit' (MPE). Load your figure in Poser, turn Inverse Kinematics off. From the menu bar select Window > Joint Editor > Zero Figure, this will zero all the rotation channels, close the Joint editor. Check that the translations of the 'Body' and 'hip' are zero. Now for the tedious part, check that the morhhs in each actor (body part) are set to zero, also check that any FBM master dials in the Body actor are zeroed. Save the figure to a pallet as 'Z'. Open MPE, load 'Z.cr2'. In the 'Save Options' tab set 'Don't save materials'. From the File menu select 'Save as', save a pose file to a pose folder, name it somthing discriptive like "FigureName-Zero.pz2". Applying theis pose will zero your figure. You can delete 'Z.cr2' as it is no longer needed. There are Python scripts to do the tedious job of zeroing all the morphs, but I don't have a link to one, you might try asking in the Poser Pyhton Forum, you might even find a Python script that does the whole job of zeroing morphs, rotations, and translations.