Hi everybody! I have a problem in applying boundry conditions on Automotive body (Body In White) to get the first bending and torsional natural frequencies.
 
As the following, are my questions:

1-What are the boundry conditions to get the first bending and torsional natural frequencies?

2-What method in ANSYS is better to get these frequencies?(i mean reduced or subspae method?)

I wish if someone can help me with or any tips to conduct this analysis.

Thanks for your help and time.