Very little simulcast used on WISCOM, and none in the Oshkosh area. You'll have to enter in each site separately.
Here's a map:
http://interop.wi.gov/docview.asp?docid=25771&locid=166
Depending on your receiver and antenna, you should probably get Fond Du Lac, Chilton and Berlin.
My suggestion would be to not program any TGs - rather, do an open scan for TGs (wildcard, whatever your scanner supports). Other than Fond Du Lac and "scan" groups, you are likely to hear not much of anything, so spending time on programming TGs very likely to be time not well spent. Don't get mislead by all of the very juicy sounding TGs in the RRDB, while I'm sure they're correct, most are simply not used.