PM - Plant Maintenance Process Flow

Hi all,

I am new to sap PM and i need to prepare a document on PM Process Flow like we have in SD (I need the process like - PR - > PO -> SO - > Invoice - > billing)

The above flow is for SD similarly i need the flow for PM. I have searched in help.sap but it doesnt satisfies me.

Can any one help me on this.

thnx in advance,

Vishnu