time dependent master data

hello gurus,

i have a info object which has name as attribute,this attribute is changing from time to time.

as io is an overwrite functionality,i am not able to see the previous data in the query.

so i want to change this attribute as time dependent master data attribute.

i went inside that attribute i am not able to see any option in that way.

please tell me exactly what to do

after doing it time dependent master data should i delete the transaction data reload it again.

kindly seggest me.

i will assign full points