Hello..
I have a table with a field name called 'Professions'. There are many same multiple values for this field, for example, there are many records with the value 'Doctor' under this field.

Here are the values under this field in the table:


I want to make a form with a combo box where the combo box shows values under 'Professions', but I do not want the value 'Doctor' to be repeated more than once...