For me I sell online so I put the name of the designer at the bottom of each ads description. Sometimes I forget to do that.. but for the most part I try to keep it on there... not for my customers.. for the designer. and for other scrollers that run across my listing.. Though most don't read it.. I still get all kinds of other scroll sawers asking me where I got the pattern etc etc.. This also helps me sometimes in locating the file on my computer should I need to make more copies of the pattern.. I used to file my patterns by designer... Now I keep files on the type of pattern it is ie clock, ornament, etc. and I keep a file only that are ones I've cut. and a file of to-do's.. so in looking for a file I've sold out of would be in my cut items folder then sub categorized by what the item is.. ie desk clock, wall clock, ornaments, and etc etc..
Nothing more frustrating than having someone buy a made to order item that I've sold out of and not being able to find the patter, LOL