How to group variables & check correlation of group variables wrt single variable

[SriRajesh]

Var1   Var2    Var3  
6       4.6    5
8       5.9    6 
14      8.2    8 
6       1      2.6 
7       2.6    9.3  
9       11.2   0.2 
4       5      2.9
6       3      6
2       1      3

I want check correlation of (1) Var1,Var2,Var3 & (2)I want to group Var1&Var3=Var4 and check correlation of Var1,Var2,Var3,Var4

I want correlation table as below:

     Var1  Var2  Var3
Var1
Var2
Var3

             Var1    Var2    Var3  Var4(Var1$Var3)
Var1
Var2
Var3
Var4(Var1$Var3)