Modal analysis in ANSYS

Hi all,

I am doing modal analysis of a box placed at the table. The box is containing the electronics components inside. The electronic components are fragile to vibrations. Now i have designed the box in Pro E and have imported it in ANSY. The box is connected with the table at four corner points from the base. Note that the base of box is not placed at the table rather box is connected to table at four corner points.

After meshing the box i am facing problem in applying the boundary conditions i.e in fixing the box with table at four key points.I have imported the 3D model in ANSYS from Pro E. The location at which i will have to fix the box with table has alot of nodes and i dont know to fix it with the table.

Kindly help me and guide me

Thanks