Record Selection in Crystal Reports

I am having issues with getting the correct parameters to print in Crystal Reports.  Here is some sample data.

Table: Customer

Number        Name
123               Pulleys
456               Bobbys
789               Tommys


Table: ExtraCustomerData


Number     Keyfield     AlphaData
123            HOR001          W
123            MAI001           N
123            BIN001            3
456            HOR001          W
456            MAI001           Y
456            BIN001           4
789            HOR001         H
789            MAI001           N
789            BIN001           6

These two table are connected by the "Number" field.

I have it setup in record selection that Keyfield='HOR001'

This work fine as it is only printing the  information from the HOR001 line and not the other 2.  But now I want to further restrict record selection by only printing the HOR001 record if MAI001='N'.  

How do I do this?

Thank you.