With LiveCycle Workbench ES, you can create XDP and PDF form designs. If you have forms that were created in Adobe Acrobat or another application, you can import them as background artwork and add objects such as drop-down-lists to make them interactive.
If you are creating a PDF form design, you can select the Acrobat or Adobe Reader target version. With the target version chosen, you can see when an object is not appropriate for that version.
See also 

About creating forms