URGENT HELP: One Scatter within Multiple Boxes

Hello Guys,

I’m having some sort of difficulties. I am using Vray with the scatter and proxies feature. I want to have lot of balls to scatter in the cone shape. However, within the trunk boxes only. Do I trim out the cone inside the boxes and scatter individually? Or there are better ways to do so? (The red parts indicating what I want to remove to make it more clear)
Thank you everyone!