Marbek,
it sounds feasible, I did not try that way,
I just put everything on a page then I exported it. I created a new file with the DP720 template from the beginnig and I imported the page.
but the screens definitions were empty, so I exported all my screens from the DP700 then I imported them in the DP720 and everything did work fine.
of course updating for the touch screen is another history but it was still working with the buttons just like with the DP700,
Thanks for the advise