Excel Newbie Query: How to sort email correspondence on a register

[ak220493]

Hey all,
A newbie here, so apologise if this has been asked before. I have a register to maintain with aconex correspondences. I would like to sort the entire table by: A. Date, B. Reference No.
With the normal sort function, this carries out sort for the entire row (date - column D) before it sorts by reference no. (column B). Is there a way to get the sort criteria to work simultaneously? I.e, check each row of Column D and then B and sort?

Thanks,