Execute SP in batches

Hi All,

I have couple of Store Procedures in SQL Server. 

Mostly a simple insert with selecting millions of rows from the base tables, and it is running daily in ware house.

How can i make this insert to work in batches, like dividing into chunks and then insert.

Select Many fields

from Mytable

Where  createdWhen >=DATEADD(month, -24, GETDATE());

My querry looks something like this. and it is used to truncate and insert everyday.

Please help me on this 

Dilip Patil..