I'm not sure that I understand your request. The script in my earlier reply (Re: join column 3 for unique values) will work with additional columns in the data file. For example, if data.txt contains this 
A1 abc yellow 1 abc
B1 xyz green 2 def
A2 cde red 3 ghi
A1 abc green 4 jkl
A2 cde yellow 5 mno
A1 abc blue 6 pqr

[download]
the output will be 
A1 abc yellow:green:blue 1:4:6 abc:jkl:pqr
A2 cde red:yellow 3:5 ghi:mno
B1 xyz green 2 def

[download]

In reply to Re^3: join column 3 for unique values by kevbot
in thread join column 3 for unique values by hello_beginner

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