1.Yes you can use multiple excel sheets in winrunner,but 
column should be unique other wise winrunner is confuse to 
identify the column.
2.test cases templets are changes depends on 
company.General test case temple is
S.No,Test case ID,Test case Name(Small 
description),Desciption(complete description),Input 
value,Expected Vaue
you can add other columns like requirement Id,step 
No,automation status(means can do automation or not),
3.Generally most companies using Bug zilla as bug tracking 
tool and familiar tools are test director and Quality 
center.Here tool will change depends on company,some 
companies they are using thier own bug tracking tool.In 
Siemens Communication systems they are using thier own 
tools like TOM,CM-Suit and some companies they use excel 
sheet itself.

S_no ,Tc_id ,Req_id ,Desc ,test step ,
exp_res,act_res,Status ,Comments


Test Step is only the optional for the above test case templet