There is an easy way to view your spare parts to see when they are at or below minimum level. Hover over the Spares Module tab and find the 'Order Parts' screen under.
From this screen, click on the filter option (funnel) in the right upper corner. You will see under the filter option, there is a dropdown entitled Quantity Status with the options to view ALL, At or Below Minimum, or Below Minimum. Be sure to click apply to view your results.