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The method to create multiple copies of prefabricated objects arranged in a grid pattern is called an array. An array allows you to create multiple copies of an object and arrange them in a regular pattern.

Here are the steps to create an array in most 3D modeling software:

1. Create the object that you want to duplicate and arrange in a grid pattern.
2. Select the object and go to the "Edit" menu.
3. Choose "Array" from the drop-down menu.
4. In the array options, you can adjust the number of copies, the spacing between them, and the orientation.
5. Apply the array and you'll have multiple copies of your object arranged in a grid pattern.

Some software also allows you to make adjustments to the array after it's been created, such as changing the number of copies or the spacing between them. This can be useful if you need to make changes later on.