Block parameter including a dropdown list

fst
fst
in 2D Drafting

Dear All,

I wish I could create a block parameter including a dropdown list.

I have edited a block and created a design table in the parameters panel Called Material.

I wish I could define the expression like {“A”,”B”,”C”} to get a drop down menu in the value field to select a single value A, B or C for the Material Parameter

Point 1 : The syntaxe of the expression seems not to be correct because I can’t get a single value in the dropdown value field (in the parameters panel)

Point 2 : The exposed field is set to On but I can’t see it the properties panel after saving and inserting my block in my drawing

TY for your help