After you have created a setup of modeling variables and calculation variables for your product model, it is time to use them in the modeling tree.

The modeling tree is a graphical representation of the X++ code that will be executed during item configuration. It is made from the nodes that handle calculations, actions for specific variable outcomes, bills of materials, routes, and messages. To simplify the modeling process, you can print a copy of your product model's variable setup by using the Composed of report. Alternatively, you can just make a list of all variables with their names and types. You will need them as you start using variables in the various nodes that will make up the product model's modeling tree.