VeSys Classic was designed to support large harnesses, the problem you are experiencing due to the original customer requirement for the "Drawing Zone" feature (this would have been about 8 or so years ago). At the time it was implemented the customer base typically had 1 large drawing showing the whole harness, it wasn't split across multiple sheets and so only 1 drawing zone was required (this is also why there is no "Bundle Break" functionality in Harness). At the time having the "Drawing Zone" independant from the drawing frame made it simpler and easier for the customers because they didn't have to create a mapping of the zones to each frame every time a new frame was used.
A workaround that has been employed by multi-sheet users is to create a very large drawing zone that will span across all frames, for example if a drawing frame was 10 zones wide and were labelled numerically they could be listed as
Sheet 1 Sheet 2
Because there is a gap between drawing frames a simple character is used to create an extra spacer column in the zones (in this case I used _ ). If you wanted the sheet name included there is no reason why it couldn't read:
1-1, 1-2, 1-3,1-4,1-5,1-6,1-7,1-8,1-9,1-10,_2-1,2-2,2-3,2-4,2-5,2-6,2-7,2-8,2-9,2-10
Hope this helps!