How to load data after remodelling

Dear Gurus,

Scenario is:

I have CUBE which is loaded with history data and daily delta is also running. Now want to add 2 more characteristics to this cube. So using remodelling tool in BI7.0, I can add 2 new char. without deleting the existing data. This 2 new char is available in attached datasource. So after adding char. to CUBE using remodeling concept, I will start the load again. But this will load new char. with only future records. How history data for these 2 char will be loaded.

I searched the form, but could not get the exact answer. I hope class IF_RSCONV_EXIT has to do something here.

Please guide.

Regards

Pank