An easy way to add a lot of objects to an area at once is to use the absorb feature. Think of this method as bringing the area to the objects rather than bringing the objects to the area. The absorb feature lets you place an area over several objects and bring them into your area all at once.
To absorb objects into an area:
Add an area if you don’t already have one.
Drag and drop the area so it overlaps any objects you want to absorb.
Click Absorb in the area’s toolbar.
Now, any objects beneath the area on the canvas will be added to the area.
For more on areas, check out these other articles: