Khubaib,
Borislav showed you how to use a UDF, if your table is in a DBC you can put the indexing function into the DBC itself so it'll always be available whenever the table is opened. If it's not in a DBC you have to make sure the UDF is in the path or you'll get an error opening the table.
>in my table there are records as:Jan,februa, march.........december
>but i want to index like this, Februa,march,december april, .........