Use transaction code CA01 to create routing for material
STEP 1 Input material number and plant, then press Enter button on your keyboard.
STEP 2 Click the “Operations” button, which you can see on the picture below.
STEP 3 Maintain the operations
In order to maintain the operations, you can choose the work center and the control key, input the description and base quantity, then click the “CompAlloc” button to allocate components to the operation.
STEP 4 Allocate components to operation
SAP system shows you all of the components of the material, if you don’t want to assign any component to the operation, you can click the “delete” button while selecting the component. After the allocating, save it, and the routing has been created successfully. Note that you should create the BOM for the material before the allocating, if you want to know how to create BOM, please see our article http://www.nicesap.com/pp-module/create-material-bom.html