Q- Duplicating sheet number

[utakecare2003]

i am doing a record dwg for a project and the client has all the sheet numbers sorted per their standard. we have different buildings, so i need to have (2) A-001 for different bldgs. but revit does not allow me to have duplicated sheet number. i saw another post that you can insert some unicode after the sheet number, but I cannot make it work maybe because i am using 2010? so, how should i do it?
i cannot change the number to anything else, so absolutely (2) A-001. What should I do?
thanks
utc