Part Creation

I am new to Netsuite, but I have been working with ERP systems for over 10 years. In other ERP Systems, you have to set up a "part" then add routing steps to this part. Then you add that "part" into assemblies/sub-assemblies. How do you create the "part" and attach routings to it in Netsuite? The only page I am finding is Assembly/Bill of Materials. Does Netsuite consider all "parts" assemblies? Any help with be greatly appreciated.