I have tabbed my report in SSRS 2012 by having my page breaks based upon grouping classname and it works great. How do I change the tab names when exporting to Excel? I tried having an expression for page name =Fields!classname.Value. In doing so, it makes all 4 of my tabs equal the first page break of Sales Division.
My tabs are based upon the grouping of classname, which in returns gives me the 4 tabs: Sales Division, VRS, ClearCaptions, and IP-relay.
You need to set the PageName of the Tablix Member (group), NOT the PageName of the Tablix itselfs.
If you got the right object, if will say "Tablix Member" (Tablix-Element in German) in the title box of the properties grid. If it's the wrong object, it will say only "table/tablix" (without member).
Also, be advised to set the sort order of the group expression, so the tabs are alphabetically sorted.
If you get the tablix instead of the tablix member, it will put the same tab name in every tab, followed by a (tabNum). That is exactly your current problem.
来源：https://stackoverflow.com/questions/24745541/ssrs-changing-tab-name-when-exporting-to-excel