There are several methods for resupplying parts during production. The first uses dynamic alternate feeders to resupply parts for feeder.
The second method is to splice the new tape and old tape together before the feeder runs out of parts.
The third method available for feeders is simply waiting for the feeder to run out of parts and then replace the feeder with another feeder already set with the same part.
For trays, there is a method for resupplying parts without stopping production.