Adding a Collaborator.
You must add a collaborator if you are going to produce a multi-project invoice, otherwise it is optional.
The last step in setting up your new project is to add a collaborator. 
This step is very important as it enables the information needed for invoicing, to be populated in the reports.
Locate the project once it has been set up and select Invite, then Add to Collaborator.
In the Too section, add the Collaborator's name, for example, for UKG projects, add UKG Australia, or for ADP projects add ADP Limited, and then click the "Send Invitation" button. 
Select Project Permissions and move the slider from Contributor to Financials, and save the change.
Lastly, set up the modules as tasks on the project, to enable the consultants to track time against them, and so that the director can check the budget against the tasks.