To specify the values for a Substring transform:
Verify that the type of the transform that is selected in the mapping routine area is Substring.
In the Properties view, select the General tab.
In the General tab, type in a value for each input field:
appears at the left of an input
field, you can display a description of the error by hovering the mouse pointer
icon over the error icon.At runtime:
The runtime environment reads the contents of the source element (a string) and extracts the sequence of characters specified by the Substring index and the Substring length.