Hello,
Thank you for contacting us and the texture is import automatically by the program, but if the model you are trying to load does not include the texture, it is likely that the file associated with that is not being read by DreamPlan. Sadly, there is no option to add the texture to the 3D items if they are not loaded automatically.
Sadly, at this moment the program does not offer an option to delete the 3D models you have added.