have a list of value in Model builder

[nadiatrigui]

Hi

I'm working with modelbuilder and I have a problem. among the tools that I used in modelbuilder the tool "calculate a field" which I run for a text field. I want to put the expression as a parameter of the model and display a drop-down list of values to choose one from these values. I could not do it. I need your help.
Thank you in advance.

[DuncanHornby]

You can't, you can expose the expression as a parameter to the model but it is a "text box" which you can type in a valid SQL expression. There is no drop-down capability.

[nadiatrigui]

thanks a lot  Duncan Hornby for the answer