Have done the small tutorial about separating out parts to allow for opening doors and the glass shattering.
You can find it here: https://youtu.be/3xCZRfein9M
Do let me know if there is anything which is unclear ro if there is something you want more detailed information on. 
I supply the starting blend file and a final low poly version as well to allow you to build a full model pack. Textures for skin and details are packed into the blend file. Unpack for creating your DDS textures.