Hi Marcelo, Thanks for the great question! Although there is not a reportable field associated with Salesforce, you can create a report that shows only projects created from Salesforce. To do so:
Create a new Project report,
In filters tab, select Project Name,
Select "Contains" and type " (via Salesforce) "
That's it! All projects created from Salesforce have that (via Salesforce) suffix in their names, so this filter will give you an accurate list. Hayk Falakyan Workfront