As I know , in every workbench of machining , there is a icon called "Post-Processor Instruction", What you should do is click htis icon and then click the program's name on the Specification Tree , a dialog box will pop up , then you can enter your PP Words.
Also there are some samples of Post Processor Word Table.Right Click the Operation on the Specification Tree ,edit it, select Machine, you would see the dialog box and the Post Processor Word Table just in it , you select what you want.