You can set these lists to automatically reorder your stock when it dips below a certain level. If you wish to maintain a certain amount of any particular parts, you can set up a part reorder list. This will allow you to define how much stock you would like to have and when the threshold is reached, (your 'minimum stock level') a purchase order will be raised for your selected supplier - the PO will be sent at 8pm, and you will get a notification letting you know.
The 'stock locations' section at the bottom of the page allows you to associate specific locations with your parts reorder lists (your various stock locations' pages can be accessed by simply searching for it - by name, using the regular search bar).
Setting up your parts reorder lists gives you the peace of mind that your stock will not drop beneath the amount you have specified without more also being ordered.