The Data Source that is available for mapping in Document Manager is the Simpology LADM (Loan Application Data Model). You can navigate to different sections of the LADM data model via "Select Master Table".
When you are working on mapping data to your Document, you are able to drill down through the LADM Datamodel to specific Merge Blocks of the datamodel that you want to use. You are able to do this via the "Select Master Table" in the Reporting section of the Editor:
If you click on this Table, you are presented with all the 'blocks' of data that are available in the engine:
The 'top' LADM is the Root Table. If you click on the Root Table, you are now working with the whole LADM.
If you then select any of the other 'blocks' of data, you will then be working within that specific section of LADM, and all the other functionality in the Reporting section will then be using the data in that 'block'.
eg if I select CompanyApplicants in the Select Master Table, I then get all the Company Applicant data in my "Insert Merge Field" data:
And all my available "Merge Blocks" are related to Company Applicants:
I can re-set the 'block' of data I am working with at any time by going back to the "Select Master Table" and selecting another 'block' to drill down to.