Okay little back ground, I use UE for writting code on a AS/400.
So I'm not a mainframer and I'm not a COBOL programmer.
I do write in RPG which is a lot stranger than your COBOL!
Now to your question, I just ignore the first 6 columns.
They were always there in your editor on the mainframe you just couldn't see them.
Here are some hints I use for writting RPG.
1) I use "Column Marks" they save my tail feathers! Wish there were 3 or 4!
2) When editing existing code I work in "Overtype" mode <Insert key>
3) Because RPG is column sensitive, I use custom tabs stops << see below >>
I'm sure you found the syntax hightlighing file for COBOL http://www.ultraedit.com/downloads/extras.html
The FTP to a AS/400 is a dream so I can only assume it works a well for the mainframe.
Actually I've sold a few copies for Ian on this feature alone!
Let me know if I can answer anything else for you.
There have been a few posts from Kedit users asking about UE.
Kedit is clone of Xedit, it's pretty expensive $149, I think.
Plus it doesn't have the built in FTP and it really helps if you know Xedit http://www.kedit.com
Now for explaination of each!
1) Pull down menu "View" --> Set Column Markers"
Once setup Column Markers you can toggle them On/Off with "Show Column Marker 1" & Show Column Marker 2"
2) Overtype and Insert is a toggle, use the <Insert> key on the keyboard.
3) Custom Tab Stops are controlled on the pull down menu "Advanced" --> "Configuration..."
Then click on the "Edit" tab about 1/2 way down "Tab Stop Value"
This is a little strange because it's relative to the last tab position!