How do I add null values or create the drop down list within each column in the attribute table?
How do I edit the null values in the drop down list?
Mapping Center Answer:
To make cells in an attribute table null you first select the records you want, right-click on the field you want to change values in, and fill in the expression text box to asign new values. For "null", you type the word null into the text box and click OK. Remember that you can do this outside an Edit session but any changes you make cannot be undone. It's always advisable to make changes inside an Edit session. Making simple field calculations explains the general process.
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