Hello MazeNod,
Let me see if I understand this. You want to take the plane out of Gmax to add textures and make the VC?
If so, I and many others create the VC 'in' Gmax. You can hide parts so that only the VC is showing, and that helps in working on it.
For texturing, you might also mean 'mapping' which is where you 'fit' a texture to parts, like the fuselage, small switches, tires, etc. What I do is take a screenshot of a part in Gmax, then paste the screenshot onto a large texture sheet in Adobe Photoshop. I then crop the part so that the screenshot is now just a tire on the texture sheet and not the entire Gmax screen. (I do not literally crop the main actual texture sheet, I clip out the background of the tire so that only the tire is seen from the 'screen grab' of the tire.
I now paste a 'real tire photo' on that screen grab, save, and then bounce back to Gmax, create a new Material in Material Manager, add the texture sheet, select tire, and click Add to attach the tire material to the tire. I then use UVW Map, and UVW UnWrap to attach and adjust the 'mapping' (UVW's) to the part and Voila..
Make sure that the small blue and white button is 'on' on your Material Manager so the materials show up.
You should now have a photo real tire.
Now, if you are wanting to export the model into FS to see how it is progressing, then I'll hand that over to the others. You should be able to 'select' parts, and click File, Export Selected, choose the FSModel as type to export as, and then click OK and in about 5 to 20 seconds, it should go BING! and done... But that is after you have set everything up, which can be trying...