@sahin.ikbal
Your question is not clear...you want to link/associate the Text Horizontal Alignment to an instance parameter? or you want to create an instance parameter that gives access to drop down menu from which you select options?
The Horizontal Alignment as it is cannot be associated no a family parameter. On the other Hand Family <Type> parameters may be your answer.
- Next the Text as a Family B
- Family B will contain 3x Text instances (Aligned Center/Left/Right) or Top/Bottom/Center
- When you link Family B in the Parent Family A, associate it with a LabelFamily<Type>
This way you will have the drop down menu
