Selecting a particular column modify & add in the text file as new column with new name retaining the old column as it is

I have a  text  file like this want a particular column to be picked & modified & added to the file as another column (ANY SUGEESTIONS PLS POST )

Input :

groupame servername 

 A a_travp_net

 Bb_travp_net

 C c_travp_net

Output

Server group ServerName

a.travp.net A  a_travp_net

b.travp.net B  b_travp_net