Design user control     To design user control you need to open visual studio then you can create new user control on form designer you can do below steps.   add data source- add formid-add axsection=add grid or group     Then Add lookup.     Add dataset   add control for lookup and set dataset and fields in    Add range on init method or any other method to get range value filter   Autopostback to true property on field to save data immediately.     selectedindexchangeevent code      this.AxDataSource1.GetDataSet().DataSetRun.AxaptaObjectAdapter.Call("datasourceRefresh",DropDownList1.SelectedItem.Text);      
Technical Tutorials x++,tips on issues or troubleshooting On Ax ERP ,Microsoft Dynamics 365,Ax 2012,Microsoft , U.S.,Business Software solution.