Qns on Usage of Year Replace Year

Hello everyone!

I was wondering how can we apply "Year replace Year" in our audit?

For example, the coming year is Wu Zi and the annual star is 1. Putting 1 in the centre and flying the stars we will get 6 in the Zi palace. Then we put 6 in the centre and fly again to get 2 in the Zi palace, which is explained as "Year replace Year".

My query is to which number do we apply and how do we apply it?

Thank you and best regards,

Kenneth