Working With Formulas in DataLink
in AXIS Users Guide - Introduction to AXIS DataLink

A formula procedure is a user-written subroutine which enables the direct definition or modification of table contents. Formulas may be defined and processed in several places throughout DataLink. Where a formula procedure is located depends on what it is to be used for and the type of information that it needs to operate correctly.  The two diagrams below illustrates the points at which a formula can be inserted into the table definition process. 

 

Once a record has been initially loaded, AXIS DataLink performs the mapping process as defined in the Field Definition window for each table:

This process is then repeated for the next valid record in your source file, and continues until all the records have been loaded.

In addition to these formula insertion points, a Batch Formula Object can be defined and placed anywhere within your main DataLink Batch Macro. This provides the user with a flexible method of inserting a formula calculation outside of these predefined formula insertion points.