How can I Reset the page Number for each group in rdlc reports

Please follow the below steps to get the page n of m for each page

Step 1:  Make sure there's a textbox in the report which contains the group expression

Step 2:  Add shared variables to track the current group and page offset

 Shared offset as Integer
 Shared currentgroup as Object

Step 3:  Add a custom function to set the shared variables and retrieve the group page number

 Public Function GetGroupPageNumber(group as Object, pagenumber as Integer) as Object
  If Not (group = currentgroup)
   offset = pagenumber - 1
   currentgroup = group
  End If
  Return pagenumber - offset
 End Function

Step 4: Use the function in the page header or footer

 =Code.GetGroupPageNumber(ReportItems!Category.Value,Globals!PageNumber)

Note:  Because this uses static variables, if two people run the report at the exact same moment, there's a slim chance one will smash the other's variable state  (In SQL 2000, this could occasionally happen due to two users paginating through the same report at the same time, not just due to exactly simultaneous executions)  If you need to be 100% certain to avoid this, you can make each of the shared variables a hash table based on user ID (Globals!UserID).