Yes you should be able to do this.
You need to unexlude the BuyerID off the RDD then add that field to RDL.
or
Use the Linked Tables option, Select BuyerID in the Picked Links tab then in the Description fields select BuyerID and Name should show in the Picked box.
If you want to add the sort then there is a bit more work to that. Refer to this. SSRS Filter