Does this go here? Well kinda. Opinions please!!

I think I understand your dilemma. In trying to catalogue my model collection I've found that I really need separate lists. One for A/C type, another for scale, and yet another for kit maker. It's time consuming, in constant need of updating, and basically a real pain to maintain three or more lists (which is why my list is never complete).

As for your decal list, I would start by listing them as: Subject / Livery (or Squadron, etc) / Scale / Maker, in that order.

HTH

stinger

Thanks for the suggestion. I really want to know what other modelers would find useful.
Well scale is easy-1/144. This is a 1/144 version of the comprehensive listings for 1/48 and 1/72. As for my own listing of kits (it need of updating as well), I just have one. It includes Subject, make, scale, and manufactuer (an a space for progress notes). I take advantage of the sort feature of the spreadsheet. I set a couple sorts, scale, subject, completion..., and I can use to preset sort. Handy that way.
I'm thinking an entry would look like this
Aircraft(subject)
US(origin of make)
Boeing 737-300(Make)
Denmark(Nationality)
Maersk Air (Affiliation)
1985-1999(Specific marking)
Max decals (#4406)-with... (Company(Item#)-Also on sheet)
Tell me what you think on my set up. The link is in my signature. I played with the colors recently and haven't got any feed back.
Feel free to make any comments. The only bad ideas are the ones that go unvoiced.

try using excel, might make things easier. but then again, i cant get excel to work very well for me, so that might be a problem in itself....

I was about to suggest a speadsheet to track models, I wonder if anyone has one pre-made that would be kind enough to donate it to the community? Maybe I'll finally pick up a book and learn how to make an effective spreadsheet? Hmm, that'll happen after I'm done with all my currently planned projects.