HI Darshan,
When you say texture "in" the .osg, do you mean the actual texture
image data stored in the .osg file? If so the .osg format doesn't
supoort this, you'll need to use OSG native binary formats .osgb and
.ive for this. In OSG master the .osgt now support inlining images,
but the existing stable releases don't supoort this.
Robert