Combine Components to Propagate Changes Easily
A button, for example, might be a component comprising a shape object and a text object.
Create Symmetry by Flipping Components
If you want to create symmetry or mirroring, create a component out of one half of whatever it is you want to use.
Create Repeating Patterns by Tiling Components
Begin by creating a single tile component at whatever size you need, then create more instances by holding down ALT and dragging the original, preferably a couple of times along each axis.