DO-IT is automatic tool and cycle selection, accomplished using a knowledge base you define according to your individual cutting needs.   This knowledge base and Layer to Knowledge level cutting is the basis for the Automation Suite inside of Router-CIM.

Using DO-IT you can place geometry on specific layers, and then associate those layers to specific cutting knowledges via a "DOIT File" or association file that stores the relationships of the layer to knowledge cutting.  DO-IT will automatically search the file for the associations and then if the layer is present and the knowledge is present in the current drawing, it will place tool paths on the part according to the associations found.