On this page you can define Visual Basic functions that can be called on pages VB code (1; 6), VB code on source data (4) and Data transfer (3). They need to be declared as class members (Shared) to make them accessible. (Shared) variables may be created in the same way and the functions will be able to use them (however their values perish as a given step ends so if you assign a value to such a variable in step Execute VB code before transferring data it won't be available in step Execute Visual Basic code on source table in memory).