1. Open a record defination,right click on field name that should be of charecter type and not more than 4 char in length.

2.right click on field name where u wann drop down and add translate values.(3rd option when u right click on field)

3.then go to record field properties-->edits-->translate table...

Thank you for ur reply

If i want to make business unit as a dropdown list wat should i do? Bcs business unit may have more than 80 values.Can u suggest me an alternate way using people code

Sure...
Instead of translate table you can use a prompt table...

create a seperate record and add a businet unit as a field in it....add all 80 values in that column.

Now on main page go to record field properties of the fiel.choose prompt table with no edits and in promp table box add a record name where u have original values.

(Eg. setup_rec is a setup rcor and bu is field in it where u will add values.

main_rec is ur main rec and bu_main is ur main field..go to pro of bu_main field.choose propmpt table with no edits and in prompt table field add setup_rec......
hope will help u

You can insert dropdown field into the page and set the properties (record name, field name etc).