table sorting .... please help.... newbie

[Sjakkie]

I have a table below that i would like to format using a module.
1 2 3 4 5
a name1 lead1 info1 tel1 add1
b name2 lead1 info2 tel2 add2
c name3 lead2 info3 tel3 add3
d name4 lead3 info4 tel4 add4
e name5 lead2 info5 tel5 add5


How can i format this into

1 2 3 4 5 6
a lead1
b name1 lead1 info1 tel1 add1
c name2 lead1 info2 tel2 add2
d lead2
e name3 lead3 info3 tel3 add3
f name5 lead3 info5 tel5 add5
g lead3
f name4 lead2 info4 tel4 add4