You can always duplicate a layout and replace the objects on it as needed, such as fields.
Is it wise to switch to a beta version of Filemaker 12 to continue developement? Why not finish it in 11 and then convert and fix all of the broken things.
Also, you can use a control in the inspector to copy a layout object's formatting, then select one or a group of newly added objects and apply the copied formatting to it in FileMaker 12. (And Jack makes a very good suggestion not to rush to upgrade to FM 12 here.)
Thanks for your responses.