Sometimes as a developer, you copy design documents from one database to the other. I do not suggest you do this. If you have too many fields on the field reference tab (you know on the Programming Pane) it'll slow the database on the web. Make no mistake... when you want to re use code, open the design document and copy what you need. Otherwise all the fields from the other database will end up in the other database slowing your forms through the web.