I have made a simple model in Blender where I have 2 rows of columns (6 columns in each). I made a row using array modifier and then copy it to obtain second row. Then I exported it as .gltf file to ...

Array-Modifier-for-Unity An extension allows you to create in Unity array of objects on the basis of the original. Work similarly to the regular modifier "Array" in 3D modelling softwares such as ...