I'm sure you already know, but for a full answer, you can do this using regex and the find and replace dialog.
Find: .{3}\s(.{3})
Replace With: \'$1\'
Search Mode: Regular Expression
.{3}\s
Matches 3 chars then a space (.{3})
matches the next three chars and captures as a group.
\'$1\'
Replaces the text that was found in the above statement with the group we captured adding quotes around it. Leaving any commas as they originally were.
With regex there are many ways to do this, this is just one example.
Edit:
From your comment I believe you wanted the the first item from the first group, and the second item from any following three groups.
The regex for that would be:
Find: (.{3})\s.{3},.{3}\s(.{3}),.{3}\s(.{3}),.{3}\s(.{3})
Replace With: \'$1\',\'$2\',\'$3\',\'$4\',
If you want to get the first group like your example now reads. Use the following regex:
Find: (.{3})\s(.{3})
Replace: \'$1\'
and finally to add commas to the end of every line, use this:
Find: $
Replace: ,