I never moprh an exported fogure or object file from Poser.

Far better to load the original object file and work on that in Blender.

See screengrab for import - export options to check.

REMARK
The import options are to load an original object file to build FBM from.

Load Roxie object file in Blender
Set the import checkboxes as per left screengrab.

Morph using the "edit" or sculpt tools in Blender.
(Do not forget to set symmetry for edit AND for Sculpt tools)

When done, save and check the boxes as per right side iof the screengrab.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!