Luc LBV

Hi there, Is there any solution for importing 3D Models with their structure ? I keep getting errors and the items i want don't import in the program... Exeeds the poitns or when imoprt works they don't give the color or structure . I'm using the website Archive 3D like suggested but most of them give the errors... And one more... HOW DO I DELETE WRONG IMPORTED 3D MODELS ???? Thanks for helping out, Luc