Insert the table through looping

I have the query like below .Bus table has 10 million records. so I want to insert into temp table by each million through looping. Instead of inserting 10 million records , I want that to be done in  looping by 1 million each.

Thanks in advance

insert

intotemp(a1,b1)

select

a1,b1

from

(

select

a,bfromBus

where

ar='a')sr