Hi @RASFE ,

You can follow the below step

• Create a purchase order for a no part ( as a easy step)
• Receive the purchase order
• Create Manual Supplier Invoice
• Match the invoice with the PO 
• Do right mouse on manual supplier invoice and choose option Project Reporting ( This will re-direct you to forward supplier invoice screen
• Now add the project & activities to which you need to distribute the invoice cost
• enter the cost & report code and save
• this will create project transaction for the respective activities & projects 

You can also create Supplier Invoice Margin ID and connect it to project such that the distribution cost will be automatically calculated based on the pre-defined % specified against the report code.

Hope this helps!!

Regards,

Mithun K V