I know myself for my purchases I often use "Hide Order" once an item is received and keep track that way.
Under Purchases where it says "More Actions" you can choose "Hide Order", it will disappear off the screen and only the ones you want showing will be there under purchases. The advantage to this is that if you later wanted (or needed) to go back item isn't deleted only "Hidden", so you can click "Show Hidden" and everything will show again.
Maybe this will help you deal with larger quantity you are trying to keep tabs on.