I'm guessing that what you want to do is import extruded text into Poser. That will require modeling software which can extrude the text as a 3D mesh. I often use Elefont to extrude text; it's free and easy to use. It exports the mesh as DXF, so you'll need a modeler which can import that format, because I generally find that are orphaned vertices and occasional poly issues which need to be tidied up. Export the tidied-up mesh from your modeler as OBJ, and import that into Poser.

The rooftop neon signage is Harlow font, extruded from Elefont, cleaned up in Silo, imported into Poser, and here 'tis:

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5