Project and Cost Centre codes can be linked to the source code directly.
To do so:
Click Finance, then Admin.
Select Source Codes.
Within the ribbon at the top, click Financials.
Click then either Link to new project or Link to existing Project.
Select which project you'd like to link to, then click Save.
The source code will now have its data linked to the Project or Cost codes.
Any data sent over to Financials or Dimensions that make use of this source code will now include this information as part of the process.