This tutorial will show you how to build an assembly line model that uses a variable to control when containers of parts will be released and brought to a hold where it can then be used at the assembly stations throughout the line. In this model a bicycle will be the main assembly object, running through two different lanes this object will pick up part one at a time. This will require an extra step in the assembly process, along with the requesting of more parts when the holds become low on parts. The same can be done with an internal database, and allow for greater control and tracking of variables.