step 1: select upper left component,
step 2: open property windows
step 3: type new reference
- repeat until done wiht all component on page. Select next page.
- repeat until done with all pages.
Hope this helps
In VX.2.3 you can use Tools - Assign Reference Designators but make sure you have packaged the design first as this utility is not a packaging tool. In some circumstances it may create duplicates, hence the advice to package first. In VX.2.4 it is Tools - Renumber Reference Designators with the same caveat about packaging first.