To use bookmarks when linking the document, make sure you've added bookmarks to the document before you start. For example, using PDF Manager, you can save the bank statement and asset purchase contract as one document with bookmarks for each section. You can then link the bookmarks to specific accounts in the Trial Balance (Workpapers). From AE/AO version 2017.1, you can also link to spreadsheet worksheets.
If you are linking to a specific PDF bookmark or Excel worksheet, select the reference from the Reference drop-down.
If the external file does not contain any references, then a link will be created to the Entire Document.
The Document name field is automatically filled with the name of the file that is to be linked to the period. If you are linking to a PDF bookmark or Excel worksheet, then the bookmark/worksheet name enclosed in brackets is added as a suffix to this value. You can change this value by deleting the existing text and entering a new Document name.
The Document name must be unique. An error message is displayed if the Document name is already in use.