scaffold question

I have a 2 tables, 1 table is called master and another one is called
reference. The reference table has id and description. In the master
table, there is one column which refers to the reference table. I have
created a foreign key and is good.

I created scaffold for both the table. I first went to the reference
table and entered all the reference data. Now what I would like to do
is to enter data in the master table using scaffold. Is there a way, I
can show a dropdown combo box which referes to the description from
reference table and when inserting, it should insert the correct id
(instead of description) into the master table.

Is there a easy way to do this?

Thanks.