I was pointed to a program called Sims 4 Tray Importer for this. I used it to export all the items I wanted to keep, and now they live in a separate folder where I can find them and put them in the active tray when I want to access them It did take a couple of hours to sort out about 4000 files, but that's partly because I was organizing them into categories.
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Hello
Just a little infornation about the tray folder.
Your tray folder contains the files of the sims households and the lots that you have saved to your library. Each sims household contains 5 files and an extra file for each extra sim. ( 1x .householdbinary, 1x trayitem, 2x .sgi, 1x .hhi and an extra sgi file for each extra sim) A Lot consists of 6-11 files, depending on how many floors your Lot has (1 trayitem file, 1blueprint file and 4 bpi files, and an extra bpi files for each extra floor).
You can sort the tray folder by date /time and that can help you to find which files relate to which sims household or build.
Comments
Just a little infornation about the tray folder.
Your tray folder contains the files of the sims households and the lots that you have saved to your library. Each sims household contains 5 files and an extra file for each extra sim. ( 1x .householdbinary, 1x trayitem, 2x .sgi, 1x .hhi and an extra sgi file for each extra sim) A Lot consists of 6-11 files, depending on how many floors your Lot has (1 trayitem file, 1blueprint file and 4 bpi files, and an extra bpi files for each extra floor).
You can sort the tray folder by date /time and that can help you to find which files relate to which sims household or build.
Using the tray importer tool that Luthien posted about can be very helpful.
http://luniversims.com/files/file/73-sims-4-tray-importer/
http://forums.thesims.com/en_US/discussion/817478/hello-come-and-introduce-yourself
http://tinyurl.com/OneRoomOneWeek
http://tinyurl.com/rosemow
My Showcase thread https://forums.thesims.com/en_US/discussion/948861/rosemow-s-rooms-showcase
http://forums.thesims.com/en_US/discussion/817478/hello-come-and-introduce-yourself
http://tinyurl.com/OneRoomOneWeek
http://tinyurl.com/rosemow
My Showcase thread https://forums.thesims.com/en_US/discussion/948861/rosemow-s-rooms-showcase
http://simsvip.com/2016/02/22/custom-showcase-the-sims-4-tray-importer-by-deevo/