sharepoint - Creating a custom column: "Append-Only" File Upload -

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i'm trying make custom column (for custom list), users can upload files without overwriting previous - way can keep past versions of files , upload newer ones , new ones append. there exist "append only" comment columns , file upload columns can see.

i'm working sharepoint designer 2007 (2010 doesn't work site), , i'm referencing code found online somewhere (http://pastebin.com/raw.php?i=0qn89meu), trying research sharepoint documentation on msdn. can open site in designer, don't know go there (it's running on web server, not opening locally).

i'm not clear on how start, thought there'd simple "right+click -> new column" feature can't find it. if point me in right direction start creating columns on site, great. thanks!

an untested idea :

  1. create document library lookup column custom list.
  2. create event receiver (itemadded , itemupdated) take attached files , move them other list (with correct lookup value). --> code visual studio
  3. grant document library read permissions.
  4. adapt view display related documents in dispform of custom list.

advantages:

  • this seems answer need
  • you gain usability of document library (nothing prevent grant edit rights other users, force check out, etc.)

disadvantages:

  • you have play lookup. can tricky sometimes, if play features
  • you split 1 business entity 2 entities. have deal cascading delete (if need it).

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