Multiple dropdowns from main entity but unable to make association between drop down entities

I have one main entity as SourceDate which have 10 columns of data among which i have created four other drop down entities.  (User, Calories, weight,Time) they are working fine but only issue is I am unable to make a dependencies among them. like If i select user the next drop downs should show only the data related to selected user. Not the data of all users. 
1 answers

Think this dropdown is a ReferenceSelector? Then you should be able to specify the selectable objects. 

This way you can only show objects that are also linked with the selected user. This can be done via xpath, or otherwise if via micoflow.