Adds an element (or another group) to a group.
The group handle, returned from the GrpOpen() function. The group handle identifies the table where all data on the associated group is stored.
The element to add to the group, from 0 to 16375.
0 (zero) if successful, otherwise an error is returned.
GrpOpen, GrpDelete, GrpIn
! Add 10 and 14 to a group.