If you run a production shop you keep on hand just what lumber and plywood is usable for the upcoming jobs.
If you have a hobby shop, or a "mixed" shop where you make furniture and millwork, some of it commissioned, some from your own imagination, then scraps are potential, they are invitations to try something new, to make breadboards that you haven't tried before, or a stool top from that interesting off-cut.
Or that 4' long piece of figured something this is just 3/8" thick x 2" wide could make a couple of pencil cases for gifts.
There is no easy way to control the growth of scraps. If you have room to store them neatly, great, if not then every few months you'll have to go through the lot and whittle it down to what you can store. Giving advice is easy!