The 3DS Max Render to Texture feature is accessible through the Rendering menu:
This feature works by creating bitmaps for the selected meshes. Once these bitmaps are created they are placed into the selected map within each mesh's material:
As seen in the above picture, only Techniques are selectable, not Texture Units, which is where bitmaps need to be placed in an OgreMax Material.
To address this shortcoming, there is a '3DS Max Render to Texture Destination' setting in each material's Technique:
...and Pass:
This setting directs bitmaps through the material to their final Texture Unit destination.