How can I add a mesh collider to all sub-objects without selecting them?

Questions & Answers
1

For example, i have a bed made of 20 objects and my player object keeps going through it. If I add a mesh collider to all objects then it will work but i believe there is another way of doing it.

2

Create a simple mesh that approximated the shape of the bed’s surface without having all the detail. Use this mesh as the bed’s collision mesh.