Generate intercompany document (AP503500)

The Generate Intercompany Documents screen will create the corresponding AP document for existing AR documents for intercompany transactions (assuming that the prerequisite configuration has been completed for those companies, accounts, etc, see here for more info: Intercompany Sales Setup: Implementation Activity)

If you need to bill time between 2 companies, how you do this may vary depending on your system configuration and modules.  When we do this internally between our 2 companies I have a project set up with the related Company B as the customer and the Company A employees put their time against that project.  Then at the end of each month, I run project billing to generate the invoice from Company A to Company B.  Once I have the AR invoice generated in Company A, then I use the Generate Intercompany Documents screen to create the related AP document in Company B.