Returns a new string that is made of part of an old string.
Syntax: SubString (String, StartIndex, Count)
If the length of the new string is beyond the length of the original string then white
spaces will be added to it.
Example:
Old = "Basic4ppc"
New = SubString (old,6, StrLength (old) - 6)
Result: New = "ppc"
This example shows how to copy a string from a specific point to the end using
StrLength.