Replicate ground perforation

Hello,

I need to create a view where I show some rods that perforate the floor.

I have activated the GROUND option in Composer so it would replicate the floor. But when I transform the rods location via Translate tool, and lower them to the floor, the ground automatically moves too, so it maintains its location relative to the actors that I moved.

Is there any way that I can move the rods downwards, keeping the ground's location, so it can replicate the floor being perforated?

Thanks in advance

SolidworksComposer