You don't need to replace Max Number with dimension limits. The option still exists. You can find it on the Presentation tab.
As far as I know the only thing that disappeared from QV11 are the OnActivate and OnLeave object triggers. The file format hasn't changed since version 7.52. Documents created in QV10 should work without change in QV11 as long as they don't use the object triggers that have been removed in QV11. The Reference Manual, the Release Notes and the Upgrade and Migration Document should have all the information you need.