Variable where clause

Hi all,=20
I have to write pl/sql proc that will return cursor.=20 Input parameters could be 1) map, 2) map, map_division or 3) map, map_division, map_subdivision.
I don't want to write separate procedures for each input parameter combinat= ion.=20
Input parameters will be matched against portions of 19 char string,=20 for example substr(roll, 4, 3) =3D map

                  substr(roll, 7, 3) =3D map_division

How do I do this ?=20

Regards, Ranko.

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