As you change values in the Parameter Matrices, either by inserting values in the edit boxes, or using commands from the Initial menu, the parameter index values may be no longer sequential. To renumber the values, select Renumber from the menu. The "With Overlap" choice means that parameter index values can be the same across 2 matrices. That is, parameter indices will overlap across matrices. If you want parameter indices to not overlap across matrices, use the Renumber No Overlap menu choice.