Apply excitation at an "angle"?

Any ideas of how to run apply at excitation at an angle to the global coordinates?  I am attempting to simulate a crash of my assembly and I would like the excitation to apply at a 20 degree angle from the front plane.  Any suggestions as to how to do it?

I tried building the part on a 20% plane and SolidWorks does not like doing that.  I also tried creating the part and then putting it on a different plane.  In addition, I tried applying the sin and cosine multiplies to the global planes only to have SolidWorks tell me that I can only apply the excitation in one direction.

Thank you.