No, this was not possible in dbase.
You must create an index tag on customer + date (given that both fields are character fields. Which is a terrible solution, by the way. However, if this is only for showing the data or for a report or something similar, you can use SQL select instead. Select * from yourtable order by customer,date.
>How to I set order to more than one field ?
>
>For example: customer + date
>
>I remember this was possible in Dbase